Question PC Turns Off It's Own

[yullbarez]

Hi recently my PC turns off it's own. PC turns off like Windows "Shutting Down" so it's not shutting down suddenly. I think it's doesn't source from Windows itself. Sometimes it's turn off when at booting screen. I've not found which component causing it. Also after it shuts down sometimes it won't turn on again sometimes it turning on again by itself. Thanks.

If it require Specs:

Intel Xeon X5450 3.60 GHz OC CPU
Asus ROG Commando Mobo
6GB Kingston(2GBX2 1GBX2) 800 MHz CL6 DDR2 RAM
Asus Strix OC R9 380 2GB GDDR5 256-Bit GPU
Samsung HD155UI 1.5 TB HDD
Samsung HD250HJ 250 GB HDD
Seasonic 700W 80+ Bronze PSU
Asus Vento A2 Case
Windows 7 Ultimate 64-Bit SP1 OS

 

[RARRAF]

probably the PSU Seasonic 700W 80+ Bronze PSU how old is it ???

 

[yullbarez]

probably the PSU Seasonic 700W 80+ Bronze PSU how old is it ???

I've bought it 2 months ago. I've solved the problem.

 

[drivinfast247]

I've solved the problem.

And how did you accomplish that?