Comments for Why won't my system recognize my USB device?

Comment from Mark Ruschman on 2009-11-19

2009-11-20T07:50:16Z

I hooked my phone into my computer via USB before, and I was able to transfer ringtones and photos. Now when I try, it won't recognize my phone. it will recognize other items hooked through USB, and I even tried different cables for my phone. What can I check on my PC to see if it can be detected? I tired all of my phone options, and nothing has worked to this point. Thanks!

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Comment from janet on 2009-11-10

2009-11-11T02:58:07Z

I have a new desktop acer, and a new hp deskjet4480. I purchased a usb cable at best buy with the comp, and printer. It says device not connected when i go through the steps on installing the printer from the cd that came with it! i am so frustrated i have a printer i cant use! I am not sure where which port the usb cable should go into, on the back of the comp, or in the front of the hardrive...is it possible that i need to purchase a new usb...or download new software from the hp website..plz help with any ideas!

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Comment from syafeeqah on 2009-10-19

2009-10-20T06:09:51Z

i bought my usb cable 2 weeks ago and i have used it three times b4 and its function is okay. but today my PC cant detect my usb cable and i don't know how to solve this. Do i have to buy a new one?
Hmm.. that's sucks..

PCs don't detect the cable. They detect the device that's plugged into the other end of the cable.

20-Oct-2009

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Comment from Chantal August on 2009-10-16

2009-10-17T00:43:35Z

I have a USB flash drive which was working fine until yesterday, when I plugged it into my computer, it comes up with this message, "USB device not recognised" I have all my work on it and unfortunately I did not back up my work. Can you help me. It starts to read it with the light going on, but then stops.

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Comment from Steve on 2009-10-01

2009-10-01T13:33:21Z

I had the same problem with my dell 1710, would not read any usb unless i restarted the system. I contacted Dell support who advised me i may have a virus or malware. The answer for me was to download PC Doctor and run a scan, The scan showed up 26 types of virus and malware. You can download the software free to do a scan but you have to purchase a licence to make it remove the bugs, but it did identify a virus that no other software had. Upon removal all my usb's now work perfectly. Try the free scan it may save you a lot of lost time.

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Comment from Alexander. on 2009-09-30

2009-09-30T17:11:27Z

I wish re-booting would fix my problem.
My mouse and GPS connect OK to the USB ports, but my printer, memory stick, 7 port hub and iphone do not.
All connected ok, but for some reason, only mouse and GPS connect OK now.
Why has this happened?

Silly person

usb Have a power Maximum. Your proberly overloading the power available to it.

7 + 3 usb attatchments is not good and is the likely cause.

would proberly reduce the performance of camera and also mouse.

wish people knew physics.

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Comment from john suregoen on 2009-09-28

2009-09-28T12:07:05Z

This information is as close to useless. You forgot to add "reboot your machine" to the list of generic advice.

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Comment from Madonna on 2009-09-26

2009-09-26T20:23:10Z

Sorry, I can't offer a solution. But I have a similar problem. I have a paid subscription for Bearshare and iMesh. They were working perfectly for two years but now neither one will recognize my mp3, a Sansa. My computer, however, recognizes it as Removeable Disk, no problem. Any suggestions for a solution would be greatly appreciated.

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Comment from Cornelis on 2009-09-14

2009-09-14T15:22:17Z

i bought a 300N USB Adapter made by sitecom 2 days ago and when i woke up i put my usb adapter into my Compaq Presario CQ60 Laptop with Windows Vista Home Basic and it says the Usb can't be recognized, i reinstalled the drivers that were given with the USB device, still doesn't work. I restarted my laptop, still doesn't work. so what should i do Leo?

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Comment from Colin on 2009-06-29

2009-06-30T03:09:01Z

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Comment from kingsly123 on 2009-06-26

2009-06-27T03:14:47Z

when i try to hook my phone to the laptop with a usb cable it just makes the sound but doesn't show up in my computer

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Comment from Brendan on 2009-06-25

2009-06-25T13:52:01Z

I'm trying to help my brother fix his Fujitsu-Siemens Amilo laptop running Windows Vista. One day out of the blue, his mouse stopped working, also noticed no access to external drive. On testing NO devices would work on ANY USB connection. (tested them in other computers and they work) In the devices area WVista says all usbs Hubs are working fine and the drivers are up-to-date. However when you plug something in (say a mouse or a drive) it comes up with the message that it is an UNKNOWN device. If you follow through to 'fix' the problem it says all the latest drivers are installed. In short, windows wont let you fix it because it says there is no problem.
On instpection I did find that there were NO USB keys AT ALL (Is this usual?) in the registry under "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\" whereas on my own laptop there are many entries there. In fact there are NO entries at all USB or otherwise in the services area!

So to continue in this fix:
1. are there supposed to be at least ONE or more entries in this reg key?
2. is there a downloadable fix fot this?
3. Failing that, how can I edit his registry to enter new keys and give the correct values? I tried importing my exported keys for that services area and Windows wont let me import it into his registry. (well it does but then it says some weren't entered because they were in use - in fact NONE are entered)

Working on this for over a week now - all help appreciated.
Oh by the way I've cleanly re-installed windows Vista (using FujSiem recovery installation disks)TWICE which did it's own online update from windows in the process - still no usb devices recognised (although as I said, the Devices section says the ports are OK)

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Comment from Toni halliday on 2009-05-28

2009-05-28T12:49:26Z

ok so i bought my LG KS3360 7 months ago, it came with a lead to put files onto my computer from my phone but i lost that lead, so i bought a new one and everytime i plug the USB cable in, it says "USB device not recognized" and it keeps making the "connected" noise and then dissconects straight away.. whats up with it?

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Comment from Paul on 2009-05-19

2009-05-19T10:58:10Z

I've had to deal with a lot is the USB storage drives (eg pen drives) that start giving the 'device not recognized' error message.

One trick to try when ALL else has failed, is to
open up the casing the drive is held in.

An awful lot I have retrieved data from, the fault has been the solder on connectors worn off, or snapped or the like.

Manually holding it in the right place, requiring a fair bit of patience to get it just right, will often be recognised as a USB drive, and allow me to rescue the information.

I'd stress to try it on more than one computer before trying this.

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Comment from paul neira on 2009-05-14

2009-05-14T18:50:38Z

i installed an oiusbf family kernel on my mac and now my all of my usb ports r locked my keyboard doesnt even respond can anyone help!!!!!!!!!

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Comment from redfred on 2009-05-09

2009-05-10T02:31:45Z

i bought an ext hdd (western digital - scorpio blue 160G) but my pc can't detect the hdd. i got 2 pc one run P3 & one run P4 , i've tried on both pc.on the P3 pc fine but on P4 pc it can't detect the hdd.i'm confuse. i've tried the P4 pc with every usb device(thumb drive,digital camera, card reader etc.) & it runs ok but not the ext hdd i've just bought.
when i plug in the hdd got that normal sound detecting any usb device but in my computer there's no sign of it. i open device manager there's a yellow icon stated unknown device.

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Comment from Robert on 2009-05-04

2009-05-04T17:47:26Z

Most excellent information utilizing Computer Management & assigning drive letters to specific storage devices, in this case Kingston USB jump drives. I had letters up to Z filled having partitions & external drive but was allowed to add A & B. Great work around idea, thanks.

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Comment from Lisa on 2009-05-03

2009-05-03T15:06:44Z

My laptop HP G6000 used to know my sony ericsson and i could upload photo's fine but i think i did something in my media player on my computer because it dosent know my phone any more and i dont know what to do, please help me leo!!

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Comment from Mary Ann on 2009-04-25

2009-04-25T17:45:39Z

When I plug something into the USB ports it does'nt show up in "Computer" I don't know how else to open the information other than through "computer" and since it doesn't show that anything is plugged in I don't know what to do. I have a USB microphone and the recording software still picks it up in at least one port but it's not recoginized anywhere else. Thanks.

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Comment from Emmet on 2009-03-28

2009-03-29T03:26:14Z

hi everyone,
i have a similar problem, however it is with the usb device itself.
last year i bought a 2Gb Shintaro usb memory stick, and at first it works fine, i had a large amount of information stored on it (around 1.7gb) and it still worked fine for a few more months... then towards the end of last year my computer stopped recognising it. i have tried connecting to other computers and they all don't recognise it. now my computer simply wont even agnowledge that it is there, but my usb ports are fine. so it is clearly a problem with the usb device itself. i know that the obvious thing to do is to throw it out and buy a new one, but i have over 1.5gb of important documents and information stored on it and i need to get that information off... is there anything i can do to to retrieve those documents etc??
please help me

It sounds like the USB device has failed or worn out. (Flash memory does wear out.) I don't have any recovery help for you. One lesson is to never keep only one copy of important data. Always have a backup.

- Leo
29-Mar-2009

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Comment from Amy on 2009-03-21

2009-03-22T05:40:45Z

I have a problem, too.
'USB is not recognized' shows when I try to plug in my memory card (from camera), external hard drive, and flash drive. It just happened since yesterday. What should I do? I'm wondering if it's because of the Window Update or not... I also found 'Error 8007006E' when I tried to download 2 files (the system recommended for me) from Window Update.

I use Window Vista for my laptop. Any suggestions?

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Comment from muneeb on 2009-03-19

2009-03-19T11:26:58Z

my usb devise was functioning at first but later after i restarted the computer the device is recognised but a message appears to format the device, i tried formatting it but a message then appears and says ‘WRITE PROTECTED CAN NOT BE FORMATTED’ what should i do i donot want to format the device as it contains some important data which can not be achieved another time….. please help me..

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Comment from Olivia on 2009-03-12

2009-03-12T11:48:19Z

Hi All,

I experienced the same problem with my computer not recognising my camera, iPod etc.
What I found is to make sure that the device ie. Digital Camera is charged at least over 50%, therefore it should help you with your PC recognising it.

I hope this helps with your problems!

Thanks
Olivia

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Comment from Jim on 2009-02-27

2009-02-27T21:39:32Z

My USB port on my laptop suddenly refuse to recognize any device that I plugged into it. I made of number of calls to tech support people who said, after unistalling the USB Root Hub and several other efforts, that it was a mechanical problem. They sent me a box to place my laptop into, which they would return to me in 10>12 days.
Before I placed my laptop into the box, I read the comment by "Lowry" who said that he fixed the same problem by turning off his computer, unplugging the power cord, praying then plugging the power cord back in. It worked for him and I am soooo happy. It worked for me!!!! This website saved me so much time, anguish and money.
Thanks again!!

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Comment from Bry on 2009-01-11

2009-01-12T01:04:10Z

From another Brian - THIS is the best thing I could've been taught. Thank you "Brian with an I" (From "Bryan with a Y", A.K.A. - Lone Wolf). . .

To all: One thing that I've learned with Windows is that assigning a drive letter is critical and Windows does this automatically. I'm on a server and geeze I have a lot of drives. Some of you might be experiencing this... When you plug in a USB or any external device, Windows assigns it a drive letter. BUT, Windows will only go so far. So the typical set up you'll normally see would be A (Floppy), C (Hard Drive) D (CD/DVD) E (CD/DVD). Those are the standard. Now, take into consideration of partions or being on a server where you have access to drives on the server. Now you're looking at more letters. If you plug something in to your machine now, Windows will get confused because it wants to give that new drive a letter but it's already being used. So needless to say, all the info it there but you just can't access it. Here is my cure. Right click on "My Computer"... in the pull down go to "Manage". On the left hand side you'll see a list of stuff. Go down to "Disk Management". Now, if your system is working properly, you WILL see a list of ALL active and working device drives. iPod, jump drive, external HD, C drive, partions, etc... You will see whatever it is you've got plugged into the USB as long as it's storage. Right click on that drive and click on "Change Drive Letter". Now you'll see a window in which you can pick the drive letter you want Windows to use when plugging your device in next time. Just click on "Change" then you get a scroll down of choices of every letter that hasn't been used yet. I would say start close to the end like at Z. Let me know if this helps anybody.

Posted by: Brian at March 27, 2006 11:07 AM

THIS WORKS BEAUTIFULLY with Vista - 64!

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Comment from Richard White on 2008-07-23

2008-07-23T20:05:24Z

I came to this post trying to fix a problem with USB devices not loading. After loading Windows XP on another hard drive and having the same problem, I tried the BIOS update. Toshiba Laptop! the BIOS update corrected the problem

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Comment from Leo A. Notenboom on 2008-03-01

2008-03-01T17:51:09Z

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

"This prooves it isn't a virus." - no it does not. You can't
prove a negative. There is no way to PROVE that you have no
virus.

That being said, it sure sounds like the hub has failed.
Have you tried plugging devices directly into the computer
instead? Replacing the hub?

Leo

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Comment from Suben on 2008-02-29

2008-02-29T08:53:04Z

I have read the article on the top of the page.

Our computer has never given us any problems with our USB Hub but one day it did. It couldn't recognise any Flashdrives and indentified them as Unknown. I thought it was a virus but I have done a vrus scan throughout the whole computer with Trend Micro. The message from the computer says there has been a Malfunction with the USB. I can't remember the full message. it was in a yellow balloon. I run Windows XP Home. I used Norton Ghost to upload a previous ghost image and yet the problem is still there. This prooves it isn't a virus. The computer is about 2 years old and the USB Hubs shouldn't malfunction or shouldn't stop working.

The rest of the information was copied because I was typing this on another site but I had to register to post this.

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Comment from Leo A. Notenboom on 2007-12-10

2007-12-10T20:35:33Z

-----BEGIN PGP SIGNED MESSAGE-----
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That depends entirely on exactly what computer you have and how things are set
up. I would take it to a repair shop contact the manufacturer to determine your
options.

Leo

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=AvOG
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Comment from Max on 2007-12-09

2007-12-09T13:14:58Z

Part of my USB port has snapped off what should i do. The USB (or memory sticks.) won't go in.
What should I do.
Is there anyway of getting a new USB port
Do I Have yo buy a new computer now

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Comment from Chuck Wynne on 2007-09-25

2007-09-25T15:48:22Z

When a usb device is plugged in, and doesn't come up with a drive letter, you have to go to ctrl panel, system,hardware, device manageruniversal serial bus controllers, and uninstall usb mass storage devices (start at the bottom). The pocket fob will then be recognized again, and come up with a drive letter. If it doesn't, uninstall the next one.

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Comment from George Birbilis on 2007-06-17

2007-06-17T09:12:51Z

> had purchased a Mp3 player from Germany, its
>called First 1 Mp3 player. I am now in India. I
>was listening to music in it, and to my
>stupidity it fell down. Now the mp3 player is
>not functioning and its not getting switched on.
>I tried to connect to USB in the computer and
>its not responding. What can be done to fix this
>problem.

the flash memory in it may have been erased due to the impact shock. You should find that device's manufacturer on the net in case you can download some firmware for it - also see if there's some "hard reset" process for it

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Comment from Leo Notenboom on 2006-09-20

2006-09-21T04:03:28Z

Broken? Perhaps the internal cable that connects them is loose or not connected?

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Comment from Michael on 2006-09-20

2006-09-21T02:13:50Z

my 2 usb ports in front of my computer dont work, while the 4 in the back work what could be the problem with the 2 in front

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Comment from hhg on 2006-09-14

2006-09-15T03:05:52Z

Follow-up: I plugged a 4-port USB hub into my computer and then attached my MP3 player to it, and now it is recognized by my computer and works. I do get messages that it would work *better* by attaching to a high-speed port but, of course, none of those would work. I have no idea why this has tricked my computer into recognizing the MP3 player, but I'm willing to live with this solution until I learn how to solve the original problem.

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Comment from HHG on 2006-09-13

2006-09-13T20:38:26Z

I had no idea USB devices create such distress! I tried reading all the related comments but my problem seems slightly different. My SanDisk M250 MP3 player works on my business laptop (so I know the unit is operational) but not my home desktop. However, all other USB devices work perfectly on the desktop: keyboard, mouse, webcam, printer, removable drives, etc. When I plug in the MP3 player, a get a dialog bubble that the system has recognized a new device, but it doesn't show up in My Computer, Device Manager, Disk Manager, and the Remove device safely icon disappears almost immediately. How can so many other USB devices (some quite old) work but not this modern, new device? I contacted SanDisk tech support but they were baffled. They do not make a specific driver for that product.

Any advice? Thanks!

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Comment from Dave Heaton on 2006-04-20

2006-04-20T21:47:37Z

Is it simply a question of forcing the iPod to make the USB connection? I use an iRiver H300. When you switch it on and plug it in to the USB port (Win XP on a newish PC), there is no reaction until you double-click the 'play' button on the H300, which then signals the port that it wants to connect. This works for me, although I do sometimes, for no obvious reason, have trouble making a USB printer connect, and a reboot with the printer on is the only way to get it recognised.

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Comment from Girish on 2006-03-28

2006-03-29T05:52:48Z

Hey, I've noticed a curious thing. If you plug in the device twice quickly (plugin half way, pull out and plug in again) most devices are recognized instantly. I've tried this on WinXP and win2k. It looks like a short surge of power to the device before plugging in completely works wonders for most USB problems.

Hope it helps..

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Comment from Brian on 2006-03-27

2006-03-27T19:07:52Z

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Comment from Dan on 2006-01-11

2006-01-11T23:47:51Z

I've just lost three days of my life trying to figure out why suddenly none of my pnp devices in my usb ports were being recognized by windows. I'd even gone so far as to wipe my hard drive and reinstall.
After trying every trick I could find online, to no avail, I just decided that maybe it was a hardware, not software problem. So, I opened up the computer, but everything looked OK. It was very dusty, so I blew some of that out.

Disappointed, I restarted and suddenly windows recognized my mp3 player and my camera!! I'm so damn happy right now. Unfortunately, I don't know what did it, but I'd guess that it was either unplugging the computer, jiggling wires or getting rid of some of the dust.

I read somewhere that there is a connection between electricity and usb ports, so I'd suggest to everyone having this problem at least try shutting down, unplugging your computer, plugging back in and restarting.

The nightmare is over!
Dan

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Comment from Leo on 2005-12-24

2005-12-25T05:05:26Z

It's not always the delete key to get into BIOS setup, but it's a good reminder to go check your BIOS settings to make sure that USB is enabled.

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Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
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Comment from Splinter on 2005-12-24

2005-12-25T05:00:55Z

I had a similar problem with my USB devices not being recognized. the fix was simple:

Restart the computer and tap delete key as the pc is booting up. This should take you into the Bios screen. Scroll through the options until you reach the USB section and make sure that all options are enabled. Let me know if this worked for you.

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.

Comment from Leo on 2005-12-17

2005-12-18T03:19:21Z

Most USB to serial adapters require additional software drivers to be installed. Did that come with the cable? (It's what I needed with my previous laptop and GPS unit.)

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.

Comment from nvrpc on 2005-12-17

2005-12-17T23:11:57Z

A note to Megallen but again they refuse to give any help. Maybe they don't have an answer to this request. Anyone else ever had a dealings with this issue. If so please advise.

__________________________________________

This is my fifth request for help on this subject matter and no one has responded with anything that has any sort of fix and I need one ASAP. Like yesterday. As you can see I have a platinum GPS of which you sold me a cable that went from my COM port cable and adapted to a USB port cable. Nothing has to this date allowed my GOS to be recognized by the laptops USB port. I will tell you that if I plug this GPS into my COM port of my laptop it works just fine however no one to my knowledge uses a desktop in his or her car on the road.

Serial Number = ( CH048466 )

PS: The answer needs to be in English not TW.

Thanks

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.

Comment from Leo on 2005-12-07

2005-12-08T06:21:43Z

Dave: the only thing that comes to mind is to fire up the New Hardware wizard. It should scan and hopefully plug & play will discover the ports.

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.

Comment from yeah ur cool on 2005-12-01

2005-12-01T19:43:27Z

Yeah thanks a lot, Leo. I had to figure my USB problem out on my own. That idiot up there's question was completely stupid and mine was well-written and polite. Well no more. You're about as useful as Liza Minelli. Thanks...for nothing.

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.

Comment from Leo on 2005-11-29

2005-11-30T04:40:49Z

Some cameras don't look like drives. You'll need to check the documentation for the camera, and perhaps run an application on the PC to access the pictures.

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.

Comment from Lisa on 2005-11-29

2005-11-29T22:15:31Z

Newbie here. I just got a new digital camera and I have inserted the disc and ran it through but when I try to look at my pics there isn't a removable disc icon in the my computer area. There was with my other digital camera. I did the whole add hardware and everything. Am I missing something.

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
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Comment from Dave Uhall on 2005-11-29

2005-11-29T18:53:45Z

I recently relocated a hard drive from an old computer (the C: drive, with all Windows files) to a newer tower, with more RAM, etc. I've had success, except with 3 things - the video adapter (I dont know what the new one is, and the settings for my current one are incorrect, thereby restricting my computer to 16 color, 640x480 mode) and my USB ports. this new computer has 2 of them, whereas the other computer (the old one) had none. My question to you, sir, if you care to respond, is how might I get my new hard drive's version of Windows 98 to recognize the USB ports? I ask because it is quite important, for instance, I have a USB mouse that will not work, as the USB ports are not recognized as existing. And I have no serial mouse anymore, so i have to navigate with the keyboard. Can you offer any insight? Thank you very much!! By the way, i dont know any of the manufacturers or models of the motherboard etc, but there must be some way to get it to work, right?

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.

Comment from Leo A. Notenboom on 2005-11-28

2005-11-28T19:59:23Z

"this device" -> what device? What kind of device? Manufacturer? Model? Need more information.

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
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Comment from anoymyous on 2005-11-28

2005-11-28T19:43:32Z

i have this device that worked for awhile, but then it got corruppted, i didn't format it, and the next time i pluged it it, it didn't recognize. I still haven't gotten it to work. please help.

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A comment on: Why won't my system recognize my USB device?

Tech Questions? Get Answers! - Ask Leo! ... by Leo Notenboom
Leo's Answers Newsletter - Ask Leo! in your inbox every week.