A girl here at work got a Nano for Chrissy. It was charged up and loaded with music so it was ready to go on Christmas Day. It went fine, and has done, until today. Today she brought it to work where iTunes is on her PC (I don't know what version). As soon as it was plugged into the PC, the Nano froze, as if the lock button was activated. It's now unplugged from the PC but still frozen, the lock button does nothing, no functions work and it cannot even be turned off. Any suggestions (besides throwing it out or anything else equally silly) ?