This just happened to me today after having my remote hanging from my mirror in truck all winter. I don’t know if it hit a button on the dash or what, but I couldn’t get it to power on at all. I was just about to call minn kota. After changing batterys and everything, I was very upset just like you probably are. I was checking volts on both old and new battery and popped old battery back in that was still reading 3 volts. And it worked, it powered on I was like omg it’s working. So if your having this issue try leaving the battery out for awhile so the remote resets. I don’t know if it hit one of the buttons on my dash from it hanging on mirror or what but it worked for me so just a fyi.