Have a Lowrance Mark 5x pro and while I was out tonight I couldn't differentiate anything on the graph. The screen wasn't solid blacked out but was majorly black making it impossible to find brushpiles or mark baitfish. Have not had this problem before although I am pretty new to electronics. Graph is wired to the same battery as trolling motor, only battery on boat, although transom transducer and bow mount TM. Only other thing on battery is running lights. It did not matter if the trolling motor was running or not still same problem. Even tried putting graph back in auto mode and still same problem. Have the extra cable for the transducer coiled up and zip tied together if that matters. I'm going back out tomorrow and need some things to try to get it going again, thanks!