No Audio From DVD Good audio from cd

I just replaced a cd-rw drive today with a lite on shw-160 internal dvd burner. Everything works great as far as burning, video on dvd but I get absolutly no sound from dvd movie. Install went great, changed drive from (cable select on 1nd and second drive) to slave and master (new drive) Installed nero for software…
Any stupid thing I am not looking at…

What OS?

Without appropriate codecs it cannot work.
Install mpeg2 codecs.

. If one of the drives is your boot HDD, make sure it is the Master.
. Personally, I would have stayed with CS. Shouldn’t make any difference (if done right) either way, but why change something that works if you don’t have to?