I need your suggestions. I sold a power amplifier to someone locally for $600. It was a Golden Theater GTA-1. Amp. I have sold to this person before. Solo Electronics, the maker of this amp is out of business (bankrupt). The person who purchased the amp knew this as well. I sold it to him about 10 weeks ago. After 7 weeks he contacted me and said the amp is shutting off on him after a few minutes of use. He is tech savy and I know he checked everything he could. I never ever had this problem. What should I do? If he came to me after a few days, I would refund him. But after almost 2 months I don't feel like this is my problem. He claims he never hooked the unit up till now. But I find this hard to believe. I mean he bought this so excited that he found one of these units and couldn't wait to use it. Now he says he never used it for 7 weeks. I don't believe this. I think offering a standard 30 day guarantee is more than adequate. If I bought a used piece of equipment from a dealer, they wouldn't give me more than this right? I would like to know your feedback about this situtation for I am torn between what to do. I don't want to screw the guy, but I want to protect myself even more. Taking back a broken amp and losing the $600 is not in my best interest, especially since I have already used this money to buy something else. Thanks.