Ok, I'll give you the exact play by play when I put a regular DVD in the DVD/RW drive.
Once I put the disc in, it should normally come up with a screen with choices on what to do (ie, Open with PowerDVD, explore cd, etc). This option never pops up, so basically the dvd will not autorun.
Once the DVD is in there, I can open Media Player, direct the player to the drive and play the DVD. This seems to work fine most of the time, although sometimes it will stutter. When I open PowerDVD and direct playback to the drive, it will come up with the region setting, look like it will start the movie, but nothing happens. I can see activity on the light on the drive, but it will only last for around 20 seconds and then I can here the drive spindown.
There are no visual errors after putting a DVD in the drive per se, but it will stutter when trying to play in media player and will not play at all within PowerDVD.