Woke up one morning to my Series 3 in perpetual reboot. After some troubleshooting, found that I could boot with cable card 2 ejected. Ran this way for a few weeks then tried re-seating CC2. Unit instantly rebooted, so I ejected CC2. However, it will now only boot if BOTH CC's are ejected. As soon as either is inserted, the unit perpetually reboots. I've tried all combinations of cards/slots with no success. Read that this could be a sign of a failing hard drive, so I made an image and replaced the hard drive but still have the same problem. Afraid it's either a problem with the cable card chassis or on the board somewhere. Got a lifetime subscription on the unit, so I sure would like to get it running again. Anyone experienced this problem and repaired it successfully?