Dab, nothing happens with the compressor or fan. The control panel and inside light work, but it doesn't cool at all. As soon as I power cycle the stupid thing it comes on and cools as well as always, but I can't trust it if we leave home. I'm thinking it's probably the control board, and as you suggest, it'll have a surge protector before I'm finished. I was hoping to have my suspicions confirmed before I go to the expense of replacing the board. Thanks much for your reply.