Computer turns off after waking up from sleep?

[DMTron]

Ok so I did not install any new hardware not software, but for the past week when coming back from school I wake up the pc and just go on youtube. Everything is normal but then it just turns of as if it were unplugged. No warning or anything just bam and its restarting. I do not know what is wrong with it, my cpu is overclocked but it turns of when everything isn't under load so I don't think the temps are the problem. Any ideas?

 

[warhead0]

check your 'Event Viewer' Hopefully Windows has created a log of whats going wrong when it powers off.

 

[DMTron]

check your 'Event Viewer' Hopefully Windows has created a log of whats going wrong when it powers off.

It just says "Event Log service is unavailable"