Dude, I saw your post last night... and it appears nobody has answered yet, because it's hard to determine what could be the problem... I have one of these cards, but mine works all the time... maybe you should open the case and see that all the cables are properly attached, and take a look at the breakout box, see if there's a defective contact for that particular input. Failing that, maybe reinstall the drivers? I'm shooting in the dark, but it's worth a try...