Why is my keyboard not detected by my computer?

A keyboard may not be detected due to a faulty USB port, a missing or corrupted driver, a BIOS/UEFI setting that disables USB legacy support, low battery on wireless keyboards, or hardware failure in the keyboard itself. Start by trying a different USB port or a different computer to isolate whether the issue is the keyboard or the computer.

How do I fix a USB keyboard not detected in Device Manager?

Open Device Manager and look for your keyboard under 'Keyboards' or as an unknown device under 'Other devices'. Right-click and select Update driver, then Scan for hardware changes. If no keyboard appears at all, try a different USB port (preferably a rear port directly on the motherboard), reinstall the USB controller drivers, or check whether USB Legacy Support is enabled in BIOS/UEFI.

Why does my keyboard work in BIOS but not Windows?

If your keyboard works in BIOS but not in Windows, the issue is almost certainly driver-related. Boot into Safe Mode (where Windows uses generic drivers) — if the keyboard works in Safe Mode, a driver conflict or antivirus software is likely blocking it in normal mode. Reinstall the keyboard driver from Device Manager.

My Bluetooth keyboard is paired but not connecting — why?

Bluetooth keyboards that show as paired but won't connect are usually experiencing a stale pairing record. Remove the device from Bluetooth settings, put the keyboard in pairing mode (hold the pairing button for 3-5 seconds), and re-pair from scratch. Also check that Bluetooth is enabled, the keyboard battery is charged above 20%, and no other device has the keyboard exclusively paired.

Keyboard Not Detected: Wired and Wireless Fixes

Reviewed by the KeyTester Editorial Team

Your keyboard isn't doing anything. Not "some keys aren't working" — the computer doesn't even know it's plugged in. The cursor won't move in the login box, Device Manager has no keyboard entry, or your Bluetooth keyboard just stares at you with a blinking light that refuses to connect.

This is a different problem from a keyboard that's partially working. Here's the diagnostic flowchart that actually solves it.

Quick Diagnosis

Try the keyboard on a different computer first. If it works there, the issue is your computer's USB ports, drivers, or settings — follow the wired or wireless section below. If it doesn't work on any computer, you have a hardware failure and need a replacement.

Step 1: Isolate the Problem in 2 Minutes

Before you spend an hour in Device Manager, do three quick checks:

Try a different USB port. Unplug and plug into a rear motherboard port (not a USB hub or front panel port). Front panel ports often have power issues; hubs can block detection.
Try the keyboard on a different computer. If it works there, the problem is your machine. If it fails there too, the keyboard has a hardware problem.
Try a known-good keyboard on your computer. This tells you whether any keyboard is detected, which rules out a system-level USB failure.

Once you know which side the problem is on, skip to the relevant section below.

Wired USB Keyboard Not Detected

Check Device Manager

Press Win + X → Device Manager. Look under Keyboards — if your keyboard is there with a yellow warning icon, right-click → Update driver → Search automatically. If nothing is under Keyboards at all, look in Other devices for an "Unknown device."

If you see an Unknown device, right-click → Update driver. Windows should recognize it as a HID Keyboard Device. If it still says Unknown, the driver may be corrupted — right-click → Uninstall device, unplug the keyboard, wait 10 seconds, and replug. Windows will reinstall the driver automatically.

Check BIOS/UEFI USB Legacy Support

If the keyboard works in BIOS but disappears once Windows starts loading, USB Legacy Support is likely the culprit. Enter BIOS (usually Del, F2, or F10 at startup) and look under Advanced → USB Configuration. Make sure USB Legacy Support or USB Keyboard Support is enabled.

Warning

If you can't enter BIOS because the keyboard isn't detected before Windows loads, connect a USB mouse and use the on-screen keyboard (Win → Ease of Access → On-Screen Keyboard) to navigate BIOS via mouse, or connect a PS/2 keyboard if your motherboard has a PS/2 port.

USB Controller Driver Reset

Sometimes the entire USB controller needs a reset, especially after a Windows update. In Device Manager, expand Universal Serial Bus controllers. Right-click each USB Root Hub → Properties → Power Management → uncheck "Allow the computer to turn off this device to save power." Repeat for all root hubs, then restart.

If that doesn't work, uninstall the USB Root Hub entries (they'll reinstall on reboot). This forces Windows to rediscover all USB devices.

Safe Mode Test

Boot into Safe Mode (Shift + Restart → Troubleshoot → Advanced options → Startup Settings → Restart → press 4). Safe Mode uses generic Microsoft drivers. If your keyboard works in Safe Mode but not normally, a third-party driver or software (keyboard macro software, AV programs, or gaming software like Razer Synapse/Logitech G Hub) is conflicting with it.

Start disabling startup programs one by one (Win + R → msconfig → Startup tab) until the keyboard starts working in normal mode.

Wireless Keyboard Not Detected

2.4GHz Dongle Keyboards

Most wireless keyboards use a USB nano-dongle (2.4GHz, not Bluetooth). If the computer detects the dongle but not the keyboard:

Check the keyboard batteries — even if the keyboard "turns on," most 2.4GHz keyboards need fresh batteries to transmit reliably. Replace with new alkaline batteries.
Resync the keyboard to the dongle. Most models: hold the Connect button on the keyboard for 3-5 seconds. The LED should flash. The dongle should auto-pair.
Try the dongle in a different USB port — directly on a rear motherboard port.
If the computer doesn't detect the dongle at all, try the dongle on another computer. If it doesn't work there either, the dongle is dead.

Logitech Unifying Receivers

If you use a Logitech keyboard with a Unifying receiver, download Logitech Options or the Unifying Software to re-pair. The receiver shows up as a USB HID device but the keyboard may have lost its pairing record after a computer reset or OS update.

Bluetooth Keyboards

Bluetooth keyboards are a separate detection problem. If the keyboard was previously paired and stopped connecting:

Go to Settings → Bluetooth & devices. Find your keyboard and click Remove device.
Put the keyboard in pairing mode (typically hold a pairing button 3-5 seconds until the LED flashes rapidly).
Click Add device → Bluetooth → wait for the keyboard to appear and select it.
If it prompts for a PIN, type the PIN on the keyboard and press Enter.

If the keyboard never appears in the Add device scan: check that Bluetooth is enabled on your computer, the keyboard battery is above 20%, and you're within 3 feet of the computer during initial pairing. Multi-device Bluetooth keyboards (like Keychron K-series) have dedicated channel buttons — make sure you're on the correct channel for your computer.

Common Bluetooth Trap

If your Bluetooth keyboard is also paired to your phone or tablet, it may be auto-connecting to that device instead of your computer. Disconnect it from the other device first, then try pairing with your computer.

macOS: Keyboard Not Detected

On Mac, USB keyboards are detected automatically. If a USB keyboard isn't working:

Try a different USB-A port, or use a USB-C adapter if your Mac only has USB-C.
Reset the System Management Controller (SMC): shut down, unplug power, wait 15 seconds, hold Shift+Control+Option+Power for 10 seconds, release, restart.
Check System Preferences → Keyboard — if the keyboard shows but doesn't type, look for Input Sources and make sure your language is selected.

For Bluetooth on Mac: Apple menu → System Settings → Bluetooth → hover over the keyboard name → click the X to remove → re-pair by putting the keyboard in pairing mode.

After the Fix: Verify Every Key Works

Once your keyboard is detected, it's worth running a full key test before assuming everything is normal. Keyboards that were disconnected for a while, or that needed driver reinstalls, occasionally have individual keys that still don't register — especially modifier keys like Shift, Ctrl, and the Windows key.

Open the Online Keyboard Tester and press every key. It highlights each key as it registers. Any key that doesn't light up on press needs further investigation — it may be a hardware issue with that specific switch.

If the Keyboard Hardware Is the Problem

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