If you replace an older PS/2 keyboard and mouse with the newer USB type, you might find that you are not able to enter the BIOS (Basic Input/Output System). On most computers, the BIOS setting, by default, does not allow the use of a USB mouse or keyboard outside the operating system. However, you can configure the BIOS to use the USB mouse and keyboard to enter the BIOS and navigate to make needed setting changes.
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Shut down the computer and turn off the power. Disconnect the USB keyboard and mouse. Connect a PS/2 keyboard to the PS/2 connector on the back of the computer.
Turn the computer on. Press the "Delete" key repeatedly as soon as you see the initial boot screen. This will bring up the main BIOS set-up screen.
Use the arrow keys on the keyboard to navigate to the "Advanced" or "Advanced Settings" menu option. Press the "Enter" key.
Navigate to the "Integrated Peripherals" or "Peripheral Configuration" option and press the "Enter" key.
Use the down arrow key to move the cursor to the "USB Controllers" option. Use the "+" key to change the option to "Enabled."
Navigate to the "USB Legacy Function" or "USB Legacy Support" menu option. Press the "+" key to until the option field displays "Enabled."
Press the "F10" key to save changes and exit the BIOS set-up utility. The computer will restart. Before the computer reboots, press the power button on the computer and hold it for four to five seconds to shut it down completely.
Disconnect the PS/2 keyboard from the computer. Connect the USB keyboard and mouse and boot the computer. Press the "Delete" key on the keyboard to enter the BIOS when the boot screen displays. USB support is active in the BIOS.
Tips and warnings
- Keep a PS/2 keyboard handy for emergencies. In most cases, common PS/2 to USB adaptors will not work in the BIOS with legacy USB mode disabled. There are powered PS/2 to USB adaptors available; however, they usually cost more than a cheap PS/2 keyboard.
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