My 4 year old 597 has suddenly developed a problem with the buttons not working. So far, MENU, EXIT, and VIEW are not working. + and - seem to change the views. GOTO will open the pulldown box but then the arrow keys don't work. I've power cycled it several times. I would reset defaults but I can't because the MENU button doesn't do anything. Does anyone know if there's a secret trick or combination of buttons that will reset this box? I know I could send it to Humminbird but they'll want $300.00 or so to fix it and a new equivalent would be less than $500.00.

All of the screens are actually working when you can get to them but it's hit and miss. It does lock up when the "wrong" button is pushed.

Any suggestions would be appreciated.

Thanks,

MC