Helping people with computers... one answer at a time.
A computer acting erratically after a clean install indicates a deeper problem - perhaps static electric or hardware.
I have this strange problem. Suddenly the USB port stopped working. Then I noticed that the OS wasn't stable and the Ethernet didn't work. Services appear to be disabled suddenly. When I click on restart, it turns the computer off. So I figured XP was having a problem. I recovered by using a different image of Windows XP. The strange thing now is that some of the USB ports work and some don't. Some detect my keyboard and some don't. I've no idea what the problem is here.
In this excerpt from Answercast #94 I look at a computer that is behaving erratically in a way that feels like an electric and/or hardware problem.
Well, in all honesty, I can't say for certain what the problem is here but my gut reaction is that this is no longer a software problem.
If you've reinstalled Windows from a previously working image, or from scratch, and the problems persist... this feels very much like a hardware problem. In fact, I'll even be so specific as to say this kind of sounds like the hardware problem that might result from static electricity.
In other words, if for whatever reason your computer's not grounded or you end up inserting a USB drive and you've got a lot of static electricity when you do so, maybe, maybe that's the kind of a thing that could cause this kind of an issue.
It's also the kind of an issue, I suspect, that could result from power surges or power problems or whatever.
The bottom line though is regardless of exactly where it came from this really, really feels like a hardware issue, not a software issue. You're probably looking at needing to take this machine to a technician to get a hands-on diagnosis.
(Transcript lightly edited for readability.)
Next from Answercast 94- Does WPA2 wireless access control pre-empt MAC address filtering?
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