I have an MSI K8MM3 motherboard with AMD Sempron 3000 processor. Each time I power it up, it works for about 1/2 hour and then cuts out, usually when the CPU temp reaches about 31 degrees C. Is there a way to stop this happening, or have I just got to buy a super powerful fan? 31 degrees C doesn't seem a very high temperature to me. Could the 'quiet n' cool' feature be causing this ? Help !!