My Dw-D56A sees CD's, but not DVD's

Sorry if I’m posting new when I should be posting in an older thread, but I think I’ve got a problem unique to this board so far. My sony DW-56A stopped reading Dvd’s a few months ago, and I’ve been able to live with it, until now. I’m using a Dell Inspiron 6000…when I talked to dell (before the warranty ran out) the guy swore up and down that all I needed was Sonic programs. I had sonic then, but don’t now…and tried Nero as well, but that didn’t work either.

The drive obviously works, as it reads cds and blank cds fine. I’ve tried reinstalling, enabling/disabling dma, and updating firmware. I would try rolling back firmware but I’m not exactly sure how to do it.

Any insight you have would be mightily appreciated.

Test the drive in REAL DOS, SAFE MODE or in another computer if possible.
If it won’t work, RMA it (warranty)