The blue light is still showing on my Nomad 2 receiver, but I can't get any other lights. It won't stow, find, or even cut off. I happened suddenly, just wouldn't come on in the morning. I unplugged it from the back (cable) and plugged it back in. Still nothing. Is it dead? Do I need to replace it? If so, is there an upgrade? Thank for any help you can give me.