JD computer-trak 100 question

Hello and happy holidays to all. What should happen when I plug the compu trak into the planter and power it up? When I did this, all 6 lights came on and then about 2 minutes later the audible alarm started sounding. I looked in all 6 seed tubes and I have 1 sensor that is not lighting up. I plugged the power side plug into this non-working sensor from the next one over and it didn't light up. Then I took the power cord plug from the one that wasn't working and plugged it into the next one over and that one lit up. I think I can assume that this particular sensor is not working correct? I then took a rod and put it in and out of each of the working seed tubes expecting the lights on the monitor to go on and off. The lights on the monitor never blinked. The alarm then stopped sounding all by itself but the lights stayed on. Do I need to replace the faulty sensor for the rest of the monitor to work? Should the lights have blinked on the 5 that had working sensors? Please forgive me if these are stupid questions but I have never owned a monitor before. Thanks for any and all replies.
 
A shorted sensor will show failure of all rows. Grab a new sensor, it should fix this problem.
 

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