I had a screen get burn in (forgot to turn it off, oops) removed it from the laptop, waited 3 days, put it back in and it was flawless again.

I had a laptop that refused ethernet and would only ever use wifi… When the ethernet was connected. No wifi unless that cord was connected. Confirmed it was, indeed, wifi by using a dummy connector.

Bought a 10tb hdd that refused to read anything at all, opened it for giggles/curiosity and found a piece of scotch tape stuck to one of the disks and one of 4 disks completely shattered. The disk was still factory sealed (by appearance, anyways; they still had the antitamper stickers)