I have a Humminbird 787 fishfinder/GPS I purchased new about a year ago. The unit is not picking up any fish. The unit is working properly in regards to depth, speed, structure, and sonar, everyhting but locating fish. I checked the unit and the fish id is turned on, the sensitivity is turned up. I tried doing a factory reset but with no luck. The way the cables plug in the unit is that they mount in the base and the actual unit "pops on and off" and when you pop it on to the base the the cables fit inside the unit. I thought it might be that the transducer cable was not getting a good connection but would the temp, speed, depth, etc. be working and not the fish id. if that was that was the case.

Thanks for any help. Mike