I'm not sure if this counts as a disaster, since I was able to salvage it, but here goes.
About two years ago I suddenly began having some major overheating problems in my desktop and suspected that either my liquid cooling system had failed, or the thermal paste needed to be redone. I had to take it out to check either. So, I carefully edge around the seal between it and my CPU, give it a firm but steady twist to break the bond cause by the thermal paste, and POP! out comes the CPU, in spite of the lock supposed to keep it in place. I had little pins bent every which way except for straight. (for anyone who has not seen the back of these units, they have a couple hundred tiny pins, no more than about 5 millimeters in height)I was convinced right there and then I was suddenly holding a $250 piece of garbage.
I decided that for that kind of money it was worth attempting to save, and so spent the next two hours gently realigning the pins. Fortunately, it worked, and once I replaced the cooling system, ran just fine. It is still running the computer I'm using to type this in fact.