Once you replace it, i would state to pay close attention to seating the cpu into the motherboard, prior to this check using a magnifying glass all the pins on the motherboard to be 100% sure you havent bent any or other damage can be seen around the general cpu socket area.
Take youre time when attaching coolers and always (depending on clamping method used) screw them down evenly two opposite diagnals at a time.. and do not tighten two opposite corners completely, move to the other two, then back to the first two until they all reach "home" ...do it in stages.
Hope this helps...
Why would i ride the swing's when i've already been to DisneyLand..