Hi, i am having the same problem with my tsst corp ts-h652l, the firmware version is 0803. it will play all burned cds and dvds and play original dvds and cds but the sound and video is choppy. i have tried nero showtime, windvd, and media player 11, i followed advice in this thread and checked my dma settings, under 2 of the primary channel ide's it shows transfer mode:dma if available, current transfer mode n/a on the last one it says the same except the current transfer mode is ultra dma mode 5, and in one of the secondary ide channels it says current transfer mode pio only, any ideas if this is my problem???? the ultra dma mode 5 and pio only show up under device 0