My PC shuts down automatically

Payne005

Honorable
Jan 6, 2013
16
0
10,510
Specs:

Intel Pentium D 3.4Ghz
GT 630 2GB DDR3 Palit Edition
Asus G41T-M LX3
2GB RAM 1333 mhz

It only happens when playing games, I can play for 30 minutes sometimes only 4 then my PC will shutdown or restarts on its own. There are times after 6-8 minutes of gaming I decide to youtube and after about 4-6 minutes it will shutdown! I really hate it! I got a lots of disconnects/leaves in Heroes of Newerth because of this! Two things comes in my mind whether it's my crappy generic PSU or an overheating, but when I look on my temps in SpeedFan when in game all of them seems normal.

Please Help.

I wanted to know what's exactly the problem so I can replace if it is hardware.
 

Payne005

Honorable
Jan 6, 2013
16
0
10,510


I didnt mess with the BIOS...are you sure about that? why?
 

Payne005

Honorable
Jan 6, 2013
16
0
10,510

I always clean windows files, registries every week using Advance SystemCare 6 Pro but nothing helps, maybe its a PSU problem. But the fan runs fine.