sowhy PC dont start

[UncleSam]

Sometimes, my pc don't start even though power is good, I checked the power supply in the pc and its working good.

sometimes, when i am not using it for more than 2 hours, it hibernates, so when i re turn it on. It doesn't start. What could be the problems.

Thanks.
Regards

[patio]

How do you check a PSU ? ?

Have you looked at your Power Management settings in Control Panel ? ?

Much much more info as Sylvia and Cleo are both on vacation this week...