USB devices require drivers within the Windows operating system. During pre-boot, these drivers are not yet available because Windows is not loaded. Instead, USB legacy support provides minimal USB support, allowing your BIOS to recognise a USB keyboard or mouse. All modern computers have this feature, but it is possible it is not turned on for your computer. Without it, you cannot use a USB keyboard or mouse during pre-boot. Enable legacy BIOS support to allow your USB keyboard to work at pre-boot.
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Things you need
- PS/2 keyboard
Turn your computer off and connect a PS/2 keyboard to it.
Turn the computer on and enter the BIOS by hitting the appropriate function key during start-up. This function key should be displayed during start-up as the key to either enter “bios” or enter “set-up.” It is often "F2" or "Del".
Enable “legacy USB support,” sometimes called “legacy keyboard support,” in the BIOS settings. Save your changes and exit the BIOS. Turn the computer off.
Connect the USB keyboard to the computer while it is off. The USB keyboard will now work in pre-boot.
Tips and warnings
- Visit your motherboard manufacturers website for a bios update if your current bios does not have USB legacy support. A bios update may give you this functionality.
- Do not change settings in the BIOS that you do not understand. Changing some settings may your computer not to work properly or even prevent it from booting at all.
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