I can`t help, but I can lend support so you know you aren`t going crazy. Both me and a co-worker have experienced similar problems with the SA-HT80. In our cases, it isn`t any particular format of DVD that won`t play. In my case, it started with the movie "High Fidelity," so I returned that DVD as defective. Little by little, more and more DVDs refused to play, with the unit telling me "NO PLAY" and the TV screen telling me the player would not accept that "type" of disc, even though they were normal, store-bought DVDs. The only solution the two of us have found on our own is opening and closing the DVD drawer and letting it read again. Do it often enough -- sometimes it takes 20 or 30 tries -- and it will eventually read. Now, I don`t know if that will work in your case, because in our cases, the drive doesn`t go through the READ process like yours is. I have also had DVDs that would give me three or four circles in the read process and then stick, and those DVDs never would play, even though they played fine in my other players.
Lance Lindley, August 2005