ok if dma is truly off then you need to get it turned on... nothing else will help. i would say to do a cdspeed transfer rate BUT if you are not using a riplock free firmware that will tell us nothing... soooo how about a BURST RATE in cdspeed?
use search to find it (if you search with my nick you will find more than one)
transfer rate 24mb/s or better dma on
less than 24 dma off
at that point you may need to read about 300 dma threads but luckily for you they always(so far) end up with the burner working at 16x
@BOOBYTRAP -- i said welcome and i meant it. there is a world of info in this forum and lately there have been a large number of the same things out there. there are at least 2 or 3 dma threads right here right now. THIS one hadn't been responded to so i decided to point him towards the pinata.