I've got a Humminbird 718, and when I powered up yesterday, it was dead when I got into the boat. Pushed the power button, nothin. wiggled the wires, nothing.
Pulled the unit back off and it came on as soon as I put it back, without pushing the power button. Three seconds later, it shuts off, and won't come back on. It shows the power down in 2 seconds display and goes out. When I got home, I messed with it, and went through the same scenario, and it came on for like three minutes and then done the same thing, and after dark, I noticed all the buttons were lit up but the screen was blank and none of the buttons worked. Any ideas? Thanks.