I am assuming it is the hard drive. I started to read the Trouble Shooting but basically during recording a show, there will be no sound and the video is scrambled. I know it is an old one. We do not use it that much - I think we might even have our Series One somewhere, I think that was back in the day they let you upgrade. Everytime I think maybe we should get a new one, they come out with something better. I was looking at the hard drives for the TiVo and was wondering if 500G would be OK for that one? We have just have had it for so long I don't want to throw it away if it is just a HD issue. Also, I don't know if it is possible but a lot of the links don't work like TiVo Drive kits, DVRupgrade TiVo repairs, DVRupgrade: TiVo Life Extension. I don't know if they are still offering them or not. Thank you!