Have you tried complaining really hard to the local cable company. My mother-in-law was the first in her neighborhood to request HDTV service. Many calls later regarding very poor picture/sound quality, the cable guys decided the existing lines were substandard. After digging up many of her neighbors' yards and the street and replacing cable, the problem was fixed. Do any of your neighbors have HDTV's, and do they see the same problem?

Last resort: Figure out if the audio or video is fast and increase that cable's lenght by a few miles at a time until there is sync.....Colin