Keyboard Not Working? Diagnose and Fix in 5 Minutes

Step 1 — Test the keyboard first

Before trying any fix, open techtester.online/keyboard-checker/ in your browser and press every key. This gives you the exact diagnosis:

• No keys register at all: connection problem, driver issue, or Filter Keys active
• Specific keys not registering: debris under that key, key switch failure, or stuck key issue
• Wrong characters typing: wrong input language selected
• Keys registering in the checker but not in a specific app: application specific input settings

Fix 1 — Disable Filter Keys (most overlooked)

Filter Keys is a Windows accessibility feature that ignores brief or repeated keystrokes. When accidentally activated it makes the keyboard appear broken. Disable: Settings then Accessibility then Keyboard then Filter Keys then toggle Off. Filter Keys activates by holding Shift for 8 seconds — easy to trigger accidentally.

Fix 2 — Check keyboard connection

• USB keyboard: try a different USB port, bypass any hub, connect directly to the PC
• Wireless keyboard: check battery level, resync the USB receiver, try fresh batteries
• Bluetooth keyboard: remove from Bluetooth settings and repair
• Laptop keyboard: if connected via USB or Bluetooth externally, check if that is overriding the laptop keyboard

Fix 3 — Check input language

If the keyboard types wrong characters rather than not typing at all, the input language has been changed. Check the language indicator in the taskbar. Press Windows + Space to cycle between languages. Remove any accidentally added input languages in Settings then Time and Language then Language.

Fix 4 — Update or reinstall keyboard driver

• Device Manager then expand Keyboards
• Right click keyboard then Update driver then Search automatically
• If that fails: right click then Uninstall device
• Disconnect and reconnect keyboard Windows reinstalls driver automatically

Fix 5 — Clean debris from under keys

Debris under keys causes keys to stick or not actuate properly. Use compressed air directed at a 45 degree angle under the affected keys. For laptop keyboards: hold the laptop upside down at 45 degrees while using compressed air. A keycap puller removes individual keycaps for deeper cleaning.

Fix 6 — Mac keyboard not working

• System Settings then Accessibility then Keyboard then Slow Keys ensure Slow Keys is off (it requires holding keys for a set duration)
• System Settings then Keyboard then Input Sources confirm correct keyboard layout is selected
• For MacBook keyboards: System Settings then Keyboard then Keyboard Brightness ensure keyboard is not in a sleep/dim mode

Q: Why did my keyboard suddenly stop working?

Most common causes: Filter Keys accidentally activated (hold Shift 8 seconds to toggle), USB connection issue (try different port), driver needs reinstalling (Device Manager then Keyboards then Uninstall then reconnect), input language changed (Windows+Space to cycle), or debris under keys. Test exactly which keys fail at techtester.online/keyboard-checker/