So I figure the riddler is the last person you want to talk to about tech support. Sure he knows all the answers, but he's not going to make it easy for you.
Same answer for the first and second riddle, and it is probably the first thing everyone tries when attempting to sort out a misbehaving box.
The final riddle is a Lewis Carrol classic that was originally intended as being just nonsense. Other authors have ascribed their own answers (some which work quite well), but I prefer to keep the original meaning of a riddle with no answer, just to be a pain.