I just got back my old faithful dual core, that I sold a couple of years ago. The lady I sold it to said, it made a noise and went dead. Wouldn't even get to the BIOS screens. I went over and opened it up. The heatsink was no longer attached. It had broken the holding point on one side. I'm not sure if there is any other damage yet. Waiting on the new base to arrive.
What made me take notice is, I had never heard of this. In searching for the new base I came across several comments about this happening to others. Maybe they are reaching the age, where they are showing this defect.
Anyway, I would check your bases for any sign of weakening if you have a board that has an AM2 slot and uses this type of retention base.
The link is the replacement. The originals are black. Mine was on an HP board (ASUS)http://www.newegg.com/Product/Product.a ... 6835119120
Just a heads up, because I can see this possibly damaging parts, if it let's go and pops up with any force, while power is on.