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30 Dec 2012  

Windows 7 Ultimate x64

Truly yours
i think it refer to the graphic card or the ram,
because going to sleep or hibernate needs some sort of graphic support,
also when your computer wants to get sleep it tries to copy some sort information into the ram, the problem is highly possible to be on this side.
check them, check the following link to find some way to check your rams:
My System SpecsSystem Spec