PC randomly restarts itself

[xXCKAXx]

Hi,
My gaming PC has been giving me a lot of trouble lately. When ever I go play a game of any kind, after a while, my computer will randomly restart itself. I checked the temperature for all my components and it says that my GPU is running on the hot side. Is this the problem? or is it a software related problem?

specs:
- AMD Athalon II X2 B24 3.00GHz
- NVIDIA GeForce 7800 GT PCIe Graphics Card (Verto by PNY)
- DEMON Black Chrome ATX 580w Power Supply
- BioStar TA970 Motherboard
- Windows 7 Home Premium

 

[emeck]

When was the last time you dusted out the GPU?
How good is the air flow in your case?
Have you overclocked it at all?

 

[xXCKAXx]

When was the last time you dusted out the GPU?
How good is the air flow in your case?
Have you overclocked it at all?

I dusted it about 2 months ago
I have very good circulation in the case
and I have never overclocked it

 

[emeck]

Now is probably a good time to dust out that GPU again, and you could probably under volt it a bit, that could help the temps...

But im not completely sure about that restarting.. if it were windows 10 i would have an explanation, but i have never seen that happen in windows 7....

 

[xXCKAXx]

Now is probably a good time to dust out that GPU again, and you could probably under volt it a bit, that could help the temps...

But im not completely sure about that restarting.. if it were windows 10 i would have an explanation, but i have never seen that happen in windows 7....

I dusted every single fan on my computer and I under volt it. The Temperature has remained at a constant 48-51 degrees. I thought this would fix the problem but it doesn't - -". what should I do?