How to Make a USB Keyboard Work at Pre Boot

Written by kaylee finn
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How to Make a USB Keyboard Work at Pre Boot
Make your USB keyboard work at pre-boot. (keyboard #4 image by Adam Borkowski from

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.

Skill level:

Things you need

  • PS/2 keyboard

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  1. 1

    Turn your computer off and connect a PS/2 keyboard to it.

  2. 2

    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".

  3. 3

    Enable “legacy USB support,” sometimes called “legacy keyboard support,” in the BIOS settings. Save your changes and exit the BIOS. Turn the computer off.

  4. 4

    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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