Vista - Vista Ultimate x64 logs off when I put it in Sleep mode

For some reason unknown after a Vista patch my system no longer enters "Sleep mode".

I'm positive it is the result of a patch and I'm rather bitter about the fact that after months of waiting no fix has been released.

Before anyone asks, NO the system is not entering some sort of passworded screener which I've seen replies for on some other peoples post on this matter.

Situation is simple, I installed a Windows Vista critical update, and after doing so I can no longer enter sleep mode, neither through "Start -> Shutdown -> Sleep" OR by simply leaving my pc idle for a period of time and letting it attempt Hibernation/Sleep mode...it's as though in the patch Microsoft have simply messed up somewhere and made sleep mode or hibernation across the board "log off" instead. Simple fix I would assume, but no fix for months.

I'd really like this fixed in an upcoming patch.

update your bios, it mightnt support the new update.

Please don't take my response as disrespect, and if I could find any resources on my bios being linked to this sort of problem I would promptly attempt it, HOWEVER how would my bios have anything to do with what I have described.

Firstly if I attempted to enter "Sleep" mode and my pc blue screened I would look for a bios issue perhaps, heck even if I got an error popup or something in event logs to suggest the system could not handle the request I would say you are probably on the right track.

However it doesn't do any of these things, it simply performs the action as if I had simply provoked the pc to log off rather than sleep. Because of this reason I believe it is likely due to the patch AND more than likely is linked to perhaps my registry being changed in some way.

If you have a link to resource which suggests otherwise please let me know, or provide a patch fix

Wolfy83,
Check out this Tutorial to see if it helps solve your sleep mode problem.
Let us know how you go.
Power Options and Sleep Mode Problems