如果鍵盤在BIOS中不起作用，而是在Windows中工作該怎麼辦

鍵盤在Windows中工作但在BIOS中不工作通常是因為系統在操作系統加載前對硬件的支持方式不同。首先檢查BIOS/UEFI設置，確保“USB Legacy Support”或類似選項已啟用；若無法使用鍵盤導航BIOS菜單，可嘗試使用PS/2鍵盤。其次，嘗試將鍵盤插入主板後部I/O端口，避免使用USB 3.0端口，並測試其他已知可在BIOS環境中工作的鍵盤。接著，考慮更新或重置BIOS/UEFI固件，訪問主板製造商網站下載最新BIOS版本並按說明操作，或選擇“Load Setup Defaults”恢復默認設置。最後，啟用XHCI模式以支持USB 3.0鍵盤：進入BIOS設置，找到USB配置部分，將XHCI模式設為啟用狀態，保存並退出。問題可通過調整BIOS設置、更換USB端口或更新固件解決，雖需一定嘗試，但並不復雜。

If your keyboard works in Windows but not in BIOS, it's usually due to how the system handles hardware before the OS loads. The good news is, this issue is often fixable without needing new hardware.

Check BIOS/UEFI Settings First

One of the most common reasons a keyboard isn't working in BIOS is that USB support isn't enabled or configured properly. Some motherboards disable USB devices during boot unless explicitly told not to.

• Look for an option like "USB Legacy Support" , "Legacy USB Support" , or "XHCI Hand-off"
• Make sure these options are set to Enabled
• If you can't navigate the BIOS menu with your keyboard, try using a PS/2 keyboard if available

Keep in mind, the exact name and location of these settings vary by motherboard manufacturer.

Use a Different USB Port or Try a Different Keyboard

Not all USB ports are treated equally in BIOS. Front panel or hub-connected ports might not get power or recognition early in the boot process.

Try the following:

• Plug the keyboard into a rear I/O port directly on the motherboard
• Avoid USB 3.0 ports if possible — some older BIOS versions have trouble with them
• Test with a different keyboard, especially one known to work in BIOS environments

Wired keyboards tend to be more reliable than wireless ones in BIOS, since some dongles or Bluetooth modules aren't initialized until Windows starts.

Update or Reset BIOS/UEFI Firmware

Sometimes, the problem comes from outdated or misconfigured firmware.

To address this:

• Check your motherboard manufacturer's website for a BIOS update
• Follow their instructions carefully — incorrect flashing can brick your board
• Alternatively, try resetting BIOS settings to default (look for a "Load Setup Defaults" option)

Updating the BIOS can resolve compatibility issues with newer hardware, including USB controllers and input devices.

Enable XHCI Mode in BIOS (for USB 3.0 Keyboards)

Some systems use XHCI mode for USB 3.0 support, which may not be active by default in BIOS.

• Go into BIOS settings
• Navigate to the USB Configuration section
• Set XHCI Mode to Enabled
• Save and exit

This change allows better USB 3.0 support during early boot stages, which can make your keyboard functional in BIOS again.

Basically, start with the BIOS settings and USB ports, then test with another keyboard or update the firmware if needed. It's not complicated, but it does require a bit of trial and error.

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