PC Won't Powerdown! Help!!!!!!!

  segandy 10:41 23 Feb 2005
Locked

Hi,

A looooooooong tale.

A friend of mine asked me to have a look at his PC as it wasn't shutting down.
I tried all of the suggestions in Windows help, but they didn't make any difference.
I formatted and reinstalled XP, and shut down the PC a number of times manually (ie Start, Turn off Computer, Turn Off) without a problem. I continued to install various pieces of software such as drivers, firewall, Power DVD and Avast anti-Virus, again manually turning off at various stages.
He is a member of AOL and when I installed that there were connection problems, so I tried to shut down manually, but got to the Windows is shutting down screen, where the system hung, after a 'click' inside the tower.
I formatted and reinstalled again, it turned off with just XP installed, but again the PC wouldn't shut down, so I disabled the Network adapter, as suggested by XP's help, and the thing shutdown without a hitch every time.
'Great', I thought.
I installed Avast Anti-virus, and guess what? The thing wouldn't shut down again even after uninstalling it.
As I said I've tried all of the suggestions in XP's help including the ones using MSCONFIG and System Restore.
I don't think it's anything to do with Avast as I successfully shut down with it installed earlier on in the day, and I also had this prob with just XP installed (no drivers).
Does anybdy think it could be the onboard LAN?
I'm currently formatting again and awaiting any help.............................

Cheers
Andy

  segandy 10:44 23 Feb 2005

A bit more info after some more 'dabbling' -

Everytime I put a new piece of software on it does the same thing. If I unplug the PC, turn on and reboot and everything's fine, until I put a new program on. It's not the HDD as I've tried it in my PC without a hitch, and I don't think it's the software as I've tried 2 different copies of XP Pro and a copy of XP Home with the same results.

Possibly the motherboard?

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