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One other (and cheaper) thing to consider: it might be the ribbon flex cable that connects the "user interface" to the main control board. If that cable is shorted, it gives the same symptoms. I know this from personal experience. I replaced the user interface and main control boards, per instructions on several forums, and still had the same problems. I then took a look at the ribbon cable and found that it was loose around the connector and pieces of metal that had broken off were embedded inside the cable near the user interface end of the cable. I replaced it and everything suddenly worked! This was misdiagnosed by several service techs under warranty before I finally took a look at it. Check the cable!
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