|Did you by chance use a vacuum cleaner on the hardware? If so, you may have damaged components due to electro-static discharge, which is caused by the air stream passing thru the hose. Doesn't take much to zap things. |
As stated, if you bent the CPU pins but did NOT break off any you can straighten them by using a mechanical pencil without the lead installed. Use a 0.5 MM pencil. You probably pulled the CPU out of the socket when removing the heat sink/fan. You should have come here for advice BEFORE working on it. No need to disassemble anything. Blow the dust out with canned or compressed air. Works much better and is simpler.
There is a lever on the CPU socket on most motherboards. You must release that lever to remove or install the CPU.