Does this apply?
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
..
"Benny A." <Benny A.@discussions.microsoft.com> wrote in message
news:CE7D072B-7A52-43C2-ACD7-...
> I have two monitors and I'm running Windows Vista Ultimate SP1. However,
> I
> had the same problem before I upgraded to SP1. I am using a laptop and my
> mouse pointer disappears on the external montior when the laptop wakes up
> from hibernation. I can use the pointer on the external monitor, but I
> just
> cannot see it. The pointer always remains visible on my laptop's screen
> I
> generally have the monitor set as the main monitor with the laptop screen
> as
> an extension to the desktop.
>
> Hopefully someone has seen this before and can help me out with it.
>
> Thanks.