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Two things spring immediately to mind: Are the motor cables connected properly? Have you uploaded an actual program to the brick? There is at least one way to connect the cables, at either end, such that the motors will not work. For this test, make sure the cable wires go out toward the "back" of the brick and the motor. And, AFAIR, "Run" doesn't do ...


Could be the button indeed. These buttons are conductive rubber pressing on the circuit boards integrated contacts. Might need some cleaning there... Disassembly of the RCX is not easy but can be done. You have to remove the screws in the battery compartment, then pull slightly to disengage and remove the black IR front. Once this is done, you can pull out ...

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