I remember a PC (286) brought in for repair that had blown a fuse in the power supply.
Nothing was visibly wrong, so I replaced the fuse and jokingly said, “Well it’s either going to work, or it’s going to explode”.
I turned it on and the CPU promptly blew itself to bits. Literally “Bang” and the CPU was a few shards stuck to the pins (286 was soldiered directly to the main board).