No sound on new install

Question

I just installed CS5 on a brand new PC and I was using CS3 on my old computer.  For some reason I am not getting any sound out of speakers or headphones when I play from the timeline.  And Yes, I do have a waveform on the timeline so it is  conformed.  My sound plays just fine when I am outside PP, for example, using Explorer I can play an audio clip using media player.  I have gone into Preferences and tried to change the options but it didn't seem to matter or make any difference.  What am I missing?
Ted
Maybe I should add that the video/audio file on the tl is DV from my Sony vx2000.  Also, I'll add that the VU is bouncing around and shows that there is plenty of audio.
One more thing, I am using the Matrox MX02 Mini with Max.

Answer 1

No, no, no.  Typing an answer or a  comment can sure get misunderstood on a forum.  I wish we could just talk face to face instead.  NO, what I mean is that I wish I would have known about the issues with Matrox and PP before I spent the $850 for the Matrox.  I am totally happy (so far) with CS5 but not with the Matrox.  I love it!  As far as mp3, just forget I even mentioned it because it has nothing to do with the problem.  I am right now able to edit the problemmatic wedding project with sound included.  It is  working fine because the sequence setting does not include the Matrox settings.  I guess anyway.  I'm not sure of anything anymore but at least its working.
Matrox advertises full compatability with CS5 Premiere Pro but I am not getting it.  I will be going on their forum to see what they have to say about it but last night I was too upset, frustrated and tired to do it.  And als, I was trying to work on the wedding project and didn'[t want to take time away from that.
May I add here that I was also able to import and use AVCHD footage on the timeline right along with the standard dv footage.  I just had to resize the HD footage to fit properly.  It played just a smoothly as the dv footage.  I did a simple dissolve just to see if it worked and it did.  I was absolutely happy!
I guess my biggest disapointment was not getting any documentation or manuals with CS5 because I got the education version.  Had I known that beforehand I would have paid the extra money and got one with the manuals.  I want to see if I can buy them separately.
I thank you for your replies and insight,
Ted
As a sidenote I use Sound Forge to convert mp3 to 48000 16-bit whenever I have to.  I do not normally import any sound into PP that is not 48000 16-bit.