This article talks about an issue with a lot of side effects like yours.
The hybrid sleep feature and the hibernation feature in Windows Vista may
become unavailable after you use the Disk Cleanup Tool :
http://support.microsoft.com/kb/928897
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Mark L. Ferguson
..
"Powell" <(E-Mail Removed)> wrote in message
news:023193C7-438D-4F3B-8E84-(E-Mail Removed)...
> Goodday Mick:
> Thanks for your response. Acording to the Task Manager there was nothing
> running at shutdown. Of course, that's with the exception of my anti virus
> and anti spyware applications, but these two items were operating long
> before
> this little problem cropped up. To add some further information: This
> morning
> I finally downloaded a Vista update that I had been holding for about a
> week
> until I saw if there was any negative feedback (non-defender update of
> course). The update required a restart which I activated from the restart
> button on the update window. The system shutdown and restarted as it
> should.
> After running my weekly system check and cleanup I followed your
> suggestion
> and attempted a restart from the 'start' button and again it failed to do
> so.
> Once more it required a cold boot. Just for your further information, this
> blip started about two months ago but was only an occasional event.
> Sometimes
> it would restart and sometimes not. It has now progressed to the situation
> I
> have described. It is not a big deal (my finger won't wear out) but I am
> always leery of these manual on/off switches ever since I had to replace
> one
> on a previous computer.
> If this gives you any more clues as to the source of the glitch, please
> send
> me through some additional suggestions and if anyone else out there has
> some
> ideas I'd be most grateful to receive them. Once again, many thanks for
> the
> tip.
> Best regards
> Powell
> --
> PBL
>
>
> "Mick Murphy" wrote:
>
>> Right-click on the Taskbar and bring up Task Manager to see what is
>> running
>> at shutdown,
>> --
>> Mick Murphy - Qld - Australia
>>
>>
>> "Powell" wrote:
>>
>> > Good Evening Gang:
>> > Got a weird problem with the restart function in Vista. The only time
>> > Vista
>> > will restart without me having to shut it down and do a cold boot is
>> > when I
>> > have to restart after an update from Microsoft. At any other time,
>> > whether I
>> > click restart from the shutdown window, whether it's a restart after
>> > downloading an update from another application or whether it's a
>> > restart
>> > after loading in a program disk all I get is a blank screen and I have
>> > power
>> > down and do a cold reboot. It's not a major problem, but one that I
>> > would
>> > like to resolve. Any suggestions?
>> > Many thanks in advance.
>> > Powell
>> > --
>> > PBL