Comp "dies" suddenly

[Sherra]

Recently my comp have been dieing on me.

I normally on my computer 24/7, and sometimes when i wake up , i will notice that my comp is offed. It has already happened twice this week.
There was also once which was the most recent incident where i was around to witness it. It happened while the computer was just running itunes, playing music, and it just died on me.

Im not sure how will i go about narrowing down on what is causing this failure.
Temperature checked, they are normal, fans are spinning, so doesnt seem to be a case of overheating...? GPU 33degree, 44degree cpu.
hmmmmmmmm......
help ...

 

[lee-turbo]

slp mode failed to wake up?

 

[MoneyFace =p]

Got check reliability monitor from action center?

 

[Sherra]

Never on sleep mode, comp is fully awake always, just monitor off if not in use... Never check action centre yet , it's found at system tray??

 

[Sherra]

any suggestions on how do i narrow down my faulty part?

just ran an OCCT test for 1 hr.. nothing wrong..

 

[NY__chickenpie]

change PSU to test.

 

[Sherra]

Got check reliability monitor from action center?

"The previous system shutdown at 1:55:51 AM on ‎4/‎29/‎2013 was unexpected."

i just found the reliability monitor, realized 6 of these happened in the past 2 weeks, all same kind of error message.


Will try changing PSU ...
might be a possibility since my this PSU is bout 6 years + old hmm.