Help- Motors running when they shouldn't be

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Have you tried loading a new, unmodified RoboRIO project to the RoboRIO? If that makes the issue go away then the culprit could be your project.

I had a similar issue occur to another team, but that was a more sinister issue which I hope is not what is afflicting you. However, I don't think anyone would be capable of replicating this.

During build season when one of the neighboring schools stopped by our school for assistance they complained that their motors would run nonstop as soon as the robot was turned on. That didn't make much sense to me since code on a robot would take a little bit of time to boot up when powered on. They set up a time to bring their robot over to us to take a look. Turns out they had wired several components wrong to the power distribution board, including the RoboRIO. The RoboRIO was fried in such a way that it was sending junk data down every signal port including ethernet. The total damage was a RoboRIO and three Talon SRs (and the routers survived being plugged in reverse for an extended period of time!). Lesson learned: check the wiring manual before plugging in your sensitive components willy nilly!