DVDs - Can't Hear Speech, Only Background Sound
We have a range of HP Ultra Slim Desktop PCs (DC7900 and DC7800) and they all suffer a similar problem when anyone tries to play DVDs. You can hear all the background music/sound, but the speech is completely drowned out. I have looked high and low in the sound settings in control panel but can't make any sense of it. I'm sure its not a codec problem, because we have the same setup on other normal form factor PCs and don't have any issues.
Any ideas what could be causing the issue?