Hello everyone. Yesterday me and my friend replaced the CPU (2.8 i5 with compatible 2.93 i7) in my mid 2010 iMac using this tutorial:http://www.hardmac.com/articles/335/page1 . Everything works fine. iStat reports cpu temp of 35, HD= 41, optical drive= 31 and ambient=16. optical drive fan is 1000rpm, HD fan is at 1200 rpm but for some reason the CPU fan shows 0rpm while working like crazy. I spent the whole day looking for the answer on different forums, reset the SMC and PRAM, took the iMac apart again to check all the connections and even took it to apple store. Unfortunately I was told that they won't help me since I upgraded the CPU. The hardware test they ran showed indeed 0rpm for CPU fan but that's all the info i got from them. I also read somewhere that I could install resistor to slow down the fan but I have no idea which resistor to use and on which wires it should be installed. ANY help would be appreciated.