Hello, I just recently tried to upgrade my HP P4 2.8 ghz CPU to a P4 3.0.. I removed the CPU fan/heatsink, then removed the cpu chip..laid the other chip in(correctly) put the heatsink/fan back on top...then tried to boot up my PC and the power supply would come on, CD rom would flash....I noticed the cpu fan was not spinning, and on the front of my pc, I only had a amber colored light. I was thinking CPU might not have been compatible, but it fit perfectly. I put in back my previous 2.8 cpu and it still did the same thing. What am I doing wrong? Have a totally screwed up my PC? please help! Thank you!