No DVD Video

Giganews Newsgroups
Subject: No DVD Video
Posted by:  Rogeā€¦
Date: Wed, 29 Feb 2012

I am resurrecting a Gateway 500 MHz machine with 512MB RAM, running XP
SP3.  It does pretty well,  except it will not play video from video
DVDs in the player.  DVD sound (dialogue) is fine, just no video at
all.  Audio CDs play just fine.  I have tried three different drives
with same bad result.  Device Manager shows no video problem
(no yellow flags). scans show no video driver
problem.  Graphics for the few games I have loaded work fine.

What is a possible cause of no DVD video?