hi, my pc was swithing-off without warning(everything just went blank). i assumed it was over heating. when i looked inside the area below the fan (over the heat sink) was covered in a thick layer of dust. in my relative inexperince, i tried to remove the fan and clean the heatsink but ended up ripping out the whole assembly. can some1 plz tell me what would be the safest way to remove the heatsink from the CPu and then go about re-installing the heatsink. thx Ps.did i damage the cpu by pulling it out without un-locking the z socket?