Thats not much help, the front panel connectors are usually marked on the board a magnifying lens helps it should be an inline double row of riser pins on the motherboard close to the front. Also look for the model number of the Motherboard around and in-between the expansion slots if you find it post it here.
You might go here http://www.embeddedlogic.com/TH99/ and check to see if they have info on your MB. You can download the entire database or use it online. Be aware that the 50mb file expands to over a gigabyte!