Computer turning off when starting Black ops 2.

[Mikki75]

Well, I've been trying to figure out the problem but I fail... I've made tons of forum threads on different forums and they just tell me that I have to update some BIOS thing, I'm not computer expert, so I don't know.

Then I asked a computer guy on STEAM and he said to try a fresh install of windows, but I already have windows 7 Home premium from the (irl)store.
After trying to update the BIOS I've only failed, I've failed and failed.

This happens on DiRT Showdown too, and Call OF duty Blackops 2.
Please help me, I have not updated any drivers since I got it in summer 2012. Please help

-Gigabyte
-AMD FX(tm)-8120 Eight-Core Processor
-CPU speed: 3.1Ghz
-Ram: 8.2gb
-OS: Microsoft Windows 7 Home Premium Edition Service Pack 1 (build 7601), 64-bit
-Video Card: AMD Radeon HD 7800 Series

Thanks I hope someone can help me out, I really wanna try out black ops 2. Thanks!

 

[mitchell65]

I have no gaming knowledge but where did you get your copy of the Black ops 2 software?

 

[Mikki75]

I actually bought it from steam. I paid 59,99 euro for it.

 

[Hexile]

Have you tried updating your device drivers?

 

[Mikki75]

How? I don't know how to update my drivers lol...

 

[Erick Aguilar]

What type of power source do you have?
If it's incredibly weak, by the time the GPU kicks in it might bring the whole system down.