Arduino Uno not showing on OSX (10.9.2) anymore

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hi everybody,
here problem:
i got board couple of days ago (arduino uno rev3), downloaded ide , uploaded blink example , went fine. after learning basis got seeedstudio nfc shield v2.0 plugged on board, uploaded 1 of example provided library (pn532 e ndef) , nothing works anymore!!!
the arduino doesn't show on port list of ide anymore, power led on board can't connect mac...
is board gone?
is there test can run check if can recover it?
any very appreciated!!!
thank in advance info provide

davide



Arduino Forum > Using Arduino > Installation & Troubleshooting > Arduino Uno not showing on OSX (10.9.2) anymore


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