I just upgraded my TR1A from XP Home to XP Pro. Everything apepars to be okay except that I tried to play a DVD and got no sound. Since sound isn’t generally important to me, I honestly don’t remember whether or not it worked before I did the upgrade. I remember it worked when I first got the unit, but I don’t think I’ve thought about sound since then.

I don’t have the mute on. What else should I check? I assume it’s not really a hardware “problem” but just something I need to click or unclick.

check the device manager ..make sure the driver is good.