Why do I get a black screen on my computer after a while?

My friends PC starts to Boot up, goes through POST and the Windows Logo appears, then the Screen changes and gives various options of starting Windows, the keyboard does not respond and after the 30 seconds tries to boot but the monitor goes into standby mode and nothing can be seen on the screen, after pressing the Reset button, the Windows Screen appears again and the System keeps Restarting by itself with nothing on the Screen, it is not possible then to go into the BIOS to see what is happening or to change or load Default settings

im triing to help my mom fix her pc. she opened an email and the computer shut down. when she turned it back on it flashed the compaq screen with F1 and F10 at the bottom then goes to a black screen with a cursor at the top. the F1 screen brings up BIOS mode F10 and F8 do nothing and esc. bring up a boot order dialog. ive tried burning discs off my pc and putting them on hers to try and restore her windows but it doesnt seem to be reading the cd.. the cd rom is working the green light comes on and you can here the disk spin but then nothing happens and it goes back to the black screen with the cursor.. can any one walk me threw bios mode? or help me restore my moms pc? she just started a buisness and all her contacts are in the pc!! ty sharon

I too am experiencing regular periodic black screens. The power light on the lcd monitor stays on. If I turn it off and then on again after 3 or so seconds the monitor comes back to life. Other programs seem to be working okay, including audio...I noticed that when my son is logged on under his own XP userid, the problem disappears. I am beginning to suspect a virus. If so - What virus would be causing this and how do I get rid of it? I run Mcafee regularly....

I tried changing the boot up in the BIOS to the CD-ROM and put the Windows XP CD in but nothing comes up. You can hear the CD spinning for a while though.

Try to use a software to repair your LCD screen. I advise you to use the one from here: http://fixdeadpixels.uv.ro

I get the black screen after my computer has been idle for a while and the screensaver has already come on. Usually, I have to turn it off and reboot. I recently reformatted the system but it doesn't seem to be linked to that. Could it be the fan?

I was running Photoshop CS2, designing a signature for myself, right in the middle of doing my work, the computer crashed unexpectedly, hearing the eerie sound of death. 10 minutes later, when I was loading a screen in EverQuest, it crashed again. Then, I tried to check for spyware with Spybot, it didn't get through, because it crashed again. I don't know what's causing this? I may have been to a few bad sites (porn sites), or download more then 100 songs on my computer But is that really the cause of the computer crash?

I am a IT Specialist with IHS/DHHS and I have replaced over 180 motherboards with the bloating or leaky capacitors. Model(s) in question are the Dell GX270 Optiplex (all form factors) and less on the GX 280's. Symptoms were like the computer went into hibernating/powersave, you would have to restart; some would restart repeatedly; some would go black screen twice a day or once every two or three days. All would go to black screen. It was very frustrating troubleshooting each one until Dell admitted to a capacitor problem on mainboards manufactered before a certain date.

My screen was turning black after the computer had been working for a while , sometimes by clicking a link ,sometimes by itself.I increased the RAM of my computer from 512 MB to 768 by changing one of my 256 MB memory card to 512 MB memory card,since then I have not experienced any black screen and I use the advantage of having more memory as well.

AFTER FURTHER INSPECTING THE SAME ISSUE ON MY COMPUTER, I REALIZED IT WAS THE POWER SAVING FEATURE IN WINDOWS SHUTTING OFF THE MONITOR LOL!