I have a Sony DVD RW DW-Q120A.
I have a TV series box set, and a few other DVDs which works fine in all DVD players and all other computers I have except this one with the Sony drive! The drive will play other DVDs fine. The discs are in perfect condition. When I insert the disc into the drive, after a few seconds it starts to make a clicking sound and nothing appears in my computer. If you try and double click the DVD drive it freezes up until you eject the disc. It only seems to be with movies. I have dvd region free installed so I don’t think it is anthing to do with regions. I also took out a dvd drive from another computer and put it into this one alongside the Sony drive and it plays them without any problem.