Sony DW-D22A, can't read movie DVDs

Hi everyone. I have a Sony DW-D22A DVD writer, with WinXP SP3.

Some time ago - I couldn’t say when - it stopped reading DVD movies. I can perfectly read data DVDs, or movie DVD that I made myself, but movie DVDs I can’t.

I started following some advice from different places, and I found here about trying a different flash version for the DVD. . I flashed my drive (LtnFW.exe - Bys3.bin)… but the problem continues.

I removed the upper level and lower level filters, but then again, after reboot and Windows installing the filters still no fix.

If I open the drive folder from within Windows, the disk appears blank.

Where should I start? What can I do to start troubleshooting?