So your quest for the day is to beg, borrow or steal one of your brothers DVD.s and try it in your player to see if it is your player or the DVD...

Have you tried any of your coasters in your mothers machine?

Stick with DVD Shrink... I know it works very well especially with Nero...

Try a coaster in your PC to see if it plays...

Verify that your burner is on the secondary master....
Visable in the bootup info without opening the case....