I have a new to me 1159. Had it running a few other times just fine. Yesterday, turned it on and it started running in a loop. First the Humminbird logo shows, then about 5 seconds later the start menu, then about 2 seconds later the shutting down screen and then about 2 seconds later the screen still says shutting down but it gets all snowy/grainy and then starts the loop over and over and over again.
During the loop, I can press menu during the menu screen and if I’m quick enough, I can sometimes get it to the gps screen, but then the loop continues on. I have to pull the power cord for it to turn off – no buttons work except sometimes for the menu button when the menu screen appears.
Troubleshooting – I’ve checked all connections and fuses. The 859 at the bow runs off the same battery and runs fine. I put the 1159 at the 859 bow connection and the loop continues. I also tried running the newest software update. I briefly get the yellow update rectangle and if I’m quick enough, can press the two prompt buttons, but the loop continues on.
Please help!!!