My first A500 had a capslock light than seemed to be stuck on, no the key wasn't stuck, but the whole keyboard locked up. As in, wouldn't type even tho the keys pressed and appeared to spring back as they should.
Sometimes after multiple reboots it would work properly the light would go out and the keyboard would unlock. I couldn't be arsed to try and fix it, or get it fixed so bought a new (second hand) A500+ for 50 squid.