FYI - anytime a dispute is filed with Paypal, BOTH parties automatically have their account suspended for 30 days while they, Paypal, try and hash out who is in the wrong. here's a thought... have you asked them to send you a replacement powersupply? that seems like a resonable request and a cheap fix for everyone. if that doesn't fix the problem, then take it from there. just make sure you do all your corresponding from your ebay email, not your personal email. out of curiosity, does the unit turn on at all? does it POST (make beeps when you push the power button)? any fans running at all when plugged in? you might just want to make sure the power supply is actually plugged into the board inside the computer. just take the side off and follow the wires coming from the power supply. maybe you could take a pic and post it here and i can let you know if something looks out of sorts.