Vista Ultimate and XP Pro shutdown and immediately restart

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System Configuration:
HD1 - XP Pro with all updates
HD2 - Vista Ultimate with all updates
I switch OS at boot time via F10 key.
Problem:
I select Turn Off computer and system executes normal shutdown procedure. A
second or two after shutting down it Restarts. If I press the Power Btn. and
hold it down until the system shuts down, power remains off. This occurs
using either OS so I suspect something common to both; perhaps the power
supply? Any suggestions?

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Relevant Pages

  • XP Pro and Vista Ultimate shutdown and immediately restart
    ... HD2 - Vista Ultimate with all updates ... I switch OS at boot time via F10 key. ... If I press the Power Btn. ...
    (microsoft.public.windowsxp.general)
  • Re: Windows vista could not come out from hibernation (error 0xc00
    ... (ie, didnt update or install any drivers, leaving Microsoft's own ... been installing all the Windows Updates in small batches to see if it ... Configure Sleep settings in Power Options ... In the Device Manager. ...
    (microsoft.public.windowsupdate)
  • Re: Turn Off computer not working
    ... MS has fixed shutdown and power down problems before. ... updates. ... You could uncheck them all, reboot, test and then start putting them ...
    (microsoft.public.windowsxp.general)
  • Re: Turn Off computer not working
    ... MS has fixed shutdown and power down problems before. ... > is an APM tab, make sure the Enable Advanced Power Management ... MS came out with updates specifically for shutdown/power down ...
    (microsoft.public.windowsxp.general)
  • Re: Turn Off computer not working
    ... You need to determine if you have a shutdown issue or a power down ... Turn Off and Restart worked fine before the reinstall. ... MS came out with updates specifically for shutdown/power down ...
    (microsoft.public.windowsxp.general)