I have a Tivo Series 3 (original) that has been working great for years but recently started giving me the dreaded reboot issues. It started with one of my cablecards going south and no longer picking up channels. I had them replaced numerous times and finally got them working again with 2 functioning cards. However, the Tivo randomly reboots itself with greater and greater frequency now. The second you place any cablecard in the slot, the Tivo will reboot itself before the card has even been recognized by the Tivo. It will then go into a reboot cycle which may or may not loop. Sometimes, the Tivo boots back up and works for a few hours, sometimes a few minutes, before rebooting again. Having read about reboot cycles, I replaced the HD using mfstools hoping that it was simply a failing HD. However, with the new drive the reboot issues still persist. I notice that if I remove both cablecards, the tivo boots fine every time and does not go back into reboot cycles. If I leave EITHER card in either slot, the reboots still occur. Thus, I think it is safe to conclude that the issue is with the cablecard slot/connection. I don't think it's the card itself since I've had them replaced 3 times now and the problems persist and also because it reboots the instant the card touches the slot, not after the CC is recognized. So, is there anything I can do to try and fix this myself? Could a blown capacitor be doing this or a bad wire connection somewhere along the way? Or should I give up at this point and get a replacement unit? I appreciate any help/advice people have to offer! Thanks!!!