I bought an Athlon XP 2000 and am using a heatsink/fan combo that I think may not be powerful enough to handle the heat. When I put the processor in the machine it powers up but the CD-ROM light keeps blinking, I get no video and it won't POST. At first I thought the CPU may be overheating, but the motherboard has a temperature sensor which didn't go off (it went off once for a second when I didn't correctly connect the heatsink fan to the power, so I know it works). What is the problem? Should I go and buy a different heasink/fan cooler or what? Thanks!!