that's exactly what i was thinking. go up the chain at paypal. did they view the item description? did they view the correspondence? plain and simple. you sold it "as is" and showed it worked. and... he admitted that it was not doa. if there was a problem even, it would have happened within the first 10 min of playing, and even that could be an install issue. it's plain and simple. you sold him a working amp with no warranty and he admittedly received a working amp. i would open a counter-claim for fraud. call the local police department and open a case on it. if you give up, then you loose the money he paid, so why not go as far as you can on getting that money back, even if you spent that amount in any fees to get it back? the police may not be able to do anything, etc, but it will be too much of a headache for all entities, then you could offer him a partial refund in the ammount that you could sell the broken amp for. he might just get a conscience and go with it.