Black Screen Crash, CPU Fan goes %100

Asperyules

Honorable
Oct 30, 2013
2
0
10,510
Hello people, I have a problem and I think it's caused by motherboard.

While gaming my computer screen goes black and CPU fan goes %100.It's completely random, it didn't happened for 16 hours in a day and it happened in 20 mins on another day.My monitor shows black screen and orange light on power button as if I shut down my computer.

It only happens in some games.It happened in; Naruto Ultimate Ninja Storm 3 Full Burst, Risen,Risen 2,Path of Exile.It happens around 20 min - 1 hour of gameplay.
It never happened in Batman Arkham Asylum,Batman Arkham City,Terraria.All of my games are original Steam games from my account.

Num, Caps and Scroll Lock don't work.Music stops, game or any other sound stops.

I've been using the same system for about 8 months and this problem just started a week ago.I had absolutely no problem with this system before.

I checked the tempratures of everything while gaming.GPU temp around 55-65, CPU 30-35 and hard drives and other thing are around 30 too.

I didn't OC'ed anything, everything works on stock.

My CPU fan isn't stock fan, my stock fan was broken.

What I tried:
Tried 5 different GPU drivers including beta drivers, I'm using 13.4 now.
BIOS update, I updated to FB then FC version yet not worked.And I use default options for BIOS.
Checked all cables, tried different ones for GPU.I only have 1 4-pin cable for motherboard so I couldn't change that cable.
I format my PC and installed a clean Win 7 x64 again, not worked.


My Specs:
Gigabyte M68M-S2P Rev 2.3 ( 35$ motherboard, I've been using it for 2 years now.Probably this is the problem.)
AMD Phenom II x6 1075T 3.0 GHz
2x2 GB 667 MHz DDR2 Kingston Ram
Sapphire Radeon HD6850
250GB 7200 RPM Western Digital ( OS main drive )
1,5 TB Samsung HD154UI ( as archive and gaming )
Highpower 500W ( Not a bad brand AFAIK, widely used in my country )
Thermaltake Level 10 GT Case ( yep I won it in a contest, too expensive for me to buy )

Thanks in advance.
 

Asperyules

Honorable
Oct 30, 2013
2
0
10,510
I found a 350W and a 250W PSU, how can I test with those ?

And I need to add another thing, I played 7 hours of Batman Arkham City today and it never crashed.But whenever I play Naruto UNS3,Risen,Risen 2 and Path of Exile it crashes.