SONY DW-D22A wont read real dvd movies

my sony dw-d22a wont read any real dvd movies - i can burn empty dvd-r’s , i can read/write cd’'s/w - but i cannot read any real dvd movie i put in the drive - is like nothing is in the drive and no matter what program i use - even windows my computer - any dvd is like nothing in the drive.
this is a new computer with a new drive (oem)

please help