i have a humming bird wide eye fishfinder, i just got the boat and put a new floor and foam and everything in it, before i took the depth finder off it seemed to work, it gave a wrong reading on the trailer (said it was like 55 feet deep and going 20mph) but now when i hooked it back up it turns on but doesnt show anything on the screen, ive tried unpluging the transducer and turning it back on and it does the exact same thing with the transducer unpluged, does anyone know what could be wrong here???<br /> Thank You