HIBERNATION: my thoughts, never do it... If you are going to go to hibernation, just shut the PC down.
Seriously about the hibernation, if it came out of hibernation by itself, you either have two issues,
something hit the power button to turn it on, or something caused disk activity thus the return.. or as a last thought, you need to check MS for the hibernation patch or repair file.


Second about the fan, open the case and check it. If it is still running, then you needn't worry. If it is not working, simply check it by switching your fans to see if one is bad, if it is bad, then go to your nearest comp dealer and pick up a replacement. They are very cheap around $5-35 US depending on the type, quality and region where you live.

just my thoughts,
BB