I just installed my AMD Athlon 64 X2 6000 into my new computer after adding some Arctic Silver 5 thermal compound to the factory included thermal paste on the heatsink and I manage to boot into the BIOS but my CPU fan appears not to be spinning. I have it hooked into the mobo and can't see any real reason for its inability to work. Is it possible to apply the heatsink and fan upsidedown? Is there something I need to switch in the BIOS or do I need to boot into windows for it to work properly? Could having the thermal compound applied wrong keep the fan from working? Any help you guys could give me would be great. Thanks.