The roboRIO Comm light only indicates that the roboRIO is or isn't talking to the Driver Station app.
So if it is off, then the Driver Station isn't communicating with the roboRIO.
Quote:
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Originally Posted by http://wpilib.screenstepslive.com/s/4485/m/24166/l/144972-status-light-quick-reference
Comm- Off - No Communication
- Red Solid - Communication with DS, but no user code
- Red Blinking - E-stop
- Green Solid - Good communication with DS
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If your Driver Station is operating normally, then your Java code running on the roboRIO may have failed.
You might try downloading an unadulterated default program.