I was getting front usb cable error and front audio cable error on post from a Vostro 220 motherboard that I'm not using in a Dell case. I couldn't find any information on how to fix it, and this seemed like a relevant place to post...
Anyway, it's pretty easy, you just need 3 jumpers.
The audio is the Azalea standard connector.
http://www.intel.com/support/mot ... op/sb/CS-015851.htm Put the jumper on pins 2 and 4 to make it think that a front panel audio box is connected. This was good enough for me in Linux, but it doesn't do anything with the jack sense pins, so windows may mute the speaker output. In that case you'll have to come up with some way to connect pins 6, 7, and 10 together.
The USB ports seem mostly standard also (yeh, how refreshing). However, using a regular usb panel connector may not work. The shield ground pin (the one next to the missing one) needs to be connected to ground somewhere off the board. For my 220 board, this only needed to happen to USB1 and USB2, you can use USB3 however you want. So I just slapped a jumper grounding the shield pin on each to the adjacent USB ground pin as I'm not using them. If you need that many ports, you'll have to wrap a wire around the pins or something so you can still use them.