Everything was working fine yesterday, but I went on ventrilo today and my mic was only playing system sounds, no voice was being recorded.

I've tried disabling stereo mix, I've done all the obvious things like making sure it's plugged in, checking it's not muted. I've never actually used a soundcard before, and I only got this system last tuesday, so I'm pretty stumped and I don't even know where to start.

My headset is a 3.5mm jack, not usb. And yes I've tried plugging the mic jack into every audio slot. My soundcard is a Xonar DX. Drivers are up to date.

System restore was rather unconvieniently turned off by default, otherwise it would have been my first port of call.

When I'm looking at my recording devices in the sound properties menu, "Wave" and "Microphone" both show activity due to system sounds, as though they were speakers.

The only changes I've made were some fiddling around with settings from 5.1 to stereo, which I can't see having an effect, but the more info the better.

Any suggestions would really be appreciated.