I have Humminbird Wide Eye fish finder. I can turn it on and go through all the menus and even do the demo mode. But when I turn it on to use it, I see just a bar up top and it is not reading depth or anything. All I have is just that one bar up top with a zero beside it. I don't know if this is related, but in the menu, under system, I can't seem to turn it to say system on and not system off. I have download the manual but it did not help. Can any one help me?