MSI 6195 KT Pro Mainboard and Athlon issue.

I have the msi 6195 and my system hangs after 10mins of running time.

I automatically assume its a over-heating problem, but I haven't changed
anything in the last 3 years and I always maintain the system well in a dust
free environment.

I have notice the cpu/heat-sink tempereature idles at around 33 degress
celcious/90something farenheit.

So it doesn't sound like over heating...and the 4leds on the mainboard all
go red after the system freezes and my screen goes black.

I've change processors around which also has a globalwin h/s+fan and the
same thing happens.
So it's not a CPU problem by the looks of it.

Any1 from MSI able to help me on this one?