I recently pulled out a Disk ][ that had been kept in a drawer for several years. It was working when I put it away, but now it's not.
It powers up and makes the normal head banging sounds if I try to boot from it but then just spins the disk forever.
If I boot from another drive and try to read from it or format a disk with it, I get IO errors.
I opened it up and cleaned the head (which wasn't terribly dirty), but that didn't make any difference.
What else could've gone wrong with it? It's possible it got bumped around a little bit in the drawer but mostly it's just been sitting.