My trusty old TCD240 has died. I cracked the case and verified that the Power Supply was dead. I grabbed a TCD649 that was unused and lying in the closet. I put the PS of the 649 into the 240, and no luck. As soon as I connect the ribbon cable from the 'good' PS to the 'bad' MB connection, the hard drive leads (and fan leads) go dead. I disconnect the ribbon, and I've got my 5v and 12v back. So the MB is dead. Is my only option to send the unit for repair? ($150) Tivo suggestd that I can transfer my service to a newer TCD649 (irony mark here) for a $199 fee. She also said that I would need to purchase the actual hardware for $149. Your advice is appreciated. Todd in Atlanta.