I have a 6 year old series 3 with lifetime that is freezing/pixelating on HD channels. Seems to work fine on SD channels. It also freezes at times on Tivo Central and the only way to get it to sometimes work again is a reboot. I also have access to a TiVo Premiere. Can I swap power supplies and hard drives between the two units to see which is my problem or aren't they compatible? I understand I will lose everything on the new hard drive but it has never been used anyway.