Enable PS/2 in Advanced Setup (AMI BIOS). There is a label on the board which points to pin number one when connecting the PS/2 mouse adapter on the board. The Pin number two is not connected because the female connector (on PS/2 Mouse adapter) doesn't have wire on number two slot. The PS/2 mouse port is a 5 pins pin header which is located beside keyboard socket. PIN#1-Mouse Data PIN#2-N.C. (Not Connected) PIN#3-Ground PIN#4-Vcc PIN#5-Mouse Clock PIN#6-N.C. (Not Connected) You can use a PS/2 mouse only if your system has a 5 pin Pin Header next to the key board connector. It is not recommended to use a mouse cable other than that included with the FIC Mainboard package. The PS/2 mouse adapter part-number is 22-10208-01. To acquire it, contact nearest FIC Branch.