DVD movies will not play in WIN 7 MC

I have recently built a HTPC with a Gigabyte MA785 GM-US2H MB, Athlon 64×2 6000 processor, 4gb mem, WD500gb hd and LG 22x DVDRW SATA.  I have played movies in MC from flash drive and library.  when playing from DVD player I get audio but no video.  I have tried DVD’s that I have purchased, Netflix and DVD that I have burned.  I get the same results from all attempts.  Any help would be appreciated