Hands up

[MorgothErmis]

The problem,as I remember,started when I put my new video card..I think.
Then I put a new botherboard.Myself all.A rookie,thus I have problem..
The problem is that my PC freezes (and needs hard reset) after 5 minutes of use.
I wasted 200 euros or so,trying to figure out the problem.
I got myself a new CPU cooler,a new VGA cooler and I installed all of them myself.
My PC still freezes.
The guy whom I buy the coolers from,told me that this is unnatural.
Of course it is.
He told me if i changed any BIOS setup configuration.
I did not.Really,I did not.
I dunno if my CPU came overclocked ,but I don't think that the CPU is the problem.
The only thing that I haven't got a cooler for is my HDD drives (which don't have a high temperature) ,my DDR RAM (2x512)
My PC has no other coolers running but this never created any problems.

Can you please help me out here?

Maybe I have to make a configuration on the BIOS,I dunno,maybe slow down anything?..
I put my hands up.

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SPECS
AMD 2800+ Sempron 2GHz
512+512 DDR
Gigabyte 7VT600
HDD 300GB & 80GB
VGA RADEON 9600
DVD MULTIRECORDER
TFT 15'' SONY
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An help will be greatly appreciated

 

[Osiris]

have you tried testing out your memory?

 

[Snake-Eyes]

How about PSU (Power Supply Unit, just in case)?