You can enable PS2 and USB settings in BIOS by entering the BIOS set-up screen when the computer boots. You will need to changes to the appropriate settings in this screen. The exact procedures vary by system, but there are a few common methods that may work if the motherboard manual is not available for guidance. The general procedure is the same for any modern computer system, but the menu arrangement and keystrokes to enter the set-up program can vary greatly from one machine to the next.
Power on or restart the computer and watch the initial boot screen to find the keystroke required to enter BIOS set-up. This is often shown at the bottom of the screen. Typical keystrokes include pressing the "F1," "F2," "F9," "F10" or "Del" key. Press this key when the prompt appears on the screen. You can find the proper key in the computer's motherboard manual or on the website of the motherboard or computer manufacturer.
Enter the BIOS set-up screen and look for the "Advanced" or "Onboard Device Configuration" menu. Use the arrows to select your choice and press "Enter."
Change the settings for the PS2 port by moving the menu choice to the "PS2" setting. Press "Enter" to bring up a smaller menu with the options to enable or disable the PS2 ports. Select "Enabled." You can also use the arrow keys or the plus key to change the current selection from "Disabled" to "Enabled" in order to enable the PS2 port.
Change the settings for the USB port by moving the menu choice to the "USB" setting. Press "Enter" to bring up a smaller menu with options to enable or disable the USB ports. Select "Enabled." Alternatively, use the arrow keys or the plus key to change the current selection from "Disabled" to "Enabled" in order to enable the USB port.
Save the settings and exit by pressing "F10" or using the "Esc" key to back out of the current menu. Choose to save and exit from the main menu if needed. Follow any additional instructions on the screen to save or navigate the menus.
Occasionally both the PS2 and USB ports are disabled in BIOS, effectively preventing any keyboard input to allow changes to be made to the BIOS. There may be an unknown set-up password required to enter the BIOS set-up program. In these cases, it may be necessary to reset the BIOS by removing the battery on the motherboard or by momentarily moving the "Clear CMOS" jumper on the motherboard to the "Clear" position in order to reset the BIOS to factory defaults.
Always back up any important files on the hard drive and make notes of all of the settings in the BIOS that are changed so can you recover from any problems that may arise. Research BIOS choices and settings before making any changes in the BIOS to avoid unintended consequences.