I haven't used the robots for a while and when I get them out, and I can write programs and load the programs onto 12 robots. 11 of the robots work fine, but one won't recognize the light or sound sensor. It recognizes a touch sensor. I have verified the sensors works by swapping sensors and cables with other  robots (multiple times, with another teacher who is an electrical engineer watching). If I try going to "View" the sensors (on the correct ports), I get a value of "0". I have reloaded the firmware.

Any ideas?
Donald Williams P.E.
Phoebus High School
100 Ireland Street
Hampton, VA 23663

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