Another possible issue: This is the problem I have, the switch on the back is supposed to only be a reset. That is it has a spring, and should only stay in one position. Yours may be in the wrong position. I am still looking for a replacement switch, but you can rock it back and forth until the lcd looks right.
If the menu does not work, or you can force a full cup by holding the start button, this might be your issue.
Good luck.