The pin allocations for the USB header on your motherboard is different from those on the standard used by most mobos these days. I've drawn a side-by-side comparison diagram here.

If the USB header plug that comes with your cabinet is the single block type, then you're out of luck. If it comes with a small separate female plug for each wire, then look at the diagram, match the function of each line carefully with the marking on each plug, and connect each wire accordingly.
AFAIK, audio headers do not have such standards. If they are marked on the mobo itself, you'll have to match each pin with the label on each wire. If you need further help with that, just ask.
Added later: Damn. The image was OK when I posted it. Here's the link
http://s3.supload.com/free/ga-6iwfe_usb.gif/view/