How to Turn Off the Keyboard in an ASUS BIOS
1 Shut down the computer and restart it.
2 Tap the “Delete” key a few times as soon as you see the ASUS logo or the initial POST screen. Wait a few seconds for the computer to display the BIOS setup menu. Enter your System Administrator password for the BIOS if prompted.
3 Press the “Left” cursor key to navigate to the “Main” menu header if not already active. Press the “Down” cursor key to scroll down to the “Halt On” or “Halt On Errors” option, then press “Enter.”
4 Scroll down to the “All but Keyboard” value option to highlight it, then press “Enter.”
5 Press the “F10” key to save the BIOS changes and restart the computer. While the computer restarts, disconnect the keyboard. Disconnect the mouse and monitor as well if needed.