I have a HP Pavillion with a Lightscribe DVD burner (HL-DT-ST DVDRRW GSA-H21L). The problem I am having with it is that it will do everything fine (including burning lightscribe discs) EXCEPT read DVD video discs. It will read every kind of CD and DVD data discs fine. When I insert a DVD video disc it thinks there is no disc in the drive. This problem appears to have popped up out of nowhere. Anyone got any ideas as to what might be the cause of the problem and how to fix it? Thanks in advance.