Try running this powercfg command
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
"Stardust0124" <> wrote in message
news:1EF14939-8527-414A-971A-...
> Hi. I reinstalled Vista last week, and since then everytime i try to
> restart
> it, i get a black screen after windows is shutting down, and the power
> keeps
> going ~ it's like in sleep mode but i can't do anything to turn it on
> again.
>
> This didn't happen the first time i had vista installed.
> And this is not happening when the pc requiers a restart after doing
> windows
> updates.
>
> Please help !