Check the obvious first — connection and Num Lock
Two things cause the majority of “keyboard not typing” reports and both take under 30 seconds to rule out.
Check the physical connection
Unplug the keyboard cable and plug it back in firmly — USB connectors occasionally work loose. Then try a different USB port directly on the motherboard rather than through a hub. USB hubs occasionally lose power delivery to connected devices after a sleep cycle. A direct connection rules out the hub as the point of failure and ensures the keyboard gets a reliable full-power link to the machine.
Check Num Lock and Caps Lock
If letter keys are typing numbers, Num Lock is active. If everything is uppercase unexpectedly, Caps Lock is on. Press each once and retest. These lock states cause more apparent typing failures than any hardware issue and are the fastest fix when they’re the cause.
Check battery level on wireless keyboards
A wireless keyboard that stops responding is almost always a dead battery rather than hardware failure. Replace both batteries completely — don’t assume remaining charge. For 2.4GHz wireless keyboards, remove and reinsert the USB receiver after replacing batteries to force a fresh connection handshake.
Software causes — driver, OS conflict, accessibility settings
When connection checks pass, the problem is in Windows.
Filter Keys silently blocking input
Filter Keys can be disabled from Settings → Ease of Access → Keyboard by unchecking Turn on Sticky Keys and Turn on Filter Keys. Filter Keys tells Windows to ignore brief keypresses — at its most aggressive setting, a key needs to be held for over a second before it registers. This makes the keyboard appear completely dead at normal typing speed. Filter Keys activates accidentally when Shift is held for 8 seconds. If your keyboard stopped working suddenly while you were holding Shift, that’s likely the cause.
Language layout switch
Pressing Alt + Shift or Win + Space cycles through installed keyboard layouts. If the layout switched to a different language, keys produce unexpected characters or nothing at all in certain text fields. Go to Settings → Time & Language → Language & Region and confirm only one layout is active. Remove any extra language packs that don’t belong there.
Driver failure after Windows update
Disabling Fast Startup in Control Panel → Power Options forces a clean restart that reloads keyboard drivers properly rather than restoring a saved session state where a broken driver persists. After disabling Fast Startup and restarting, open Device Manager → Keyboards → right-click the keyboard entry → Uninstall device → reconnect the keyboard and let Windows reinstall the driver fresh.
Hardware causes — USB port, wireless receiver, physical damage
When software fixes don’t restore typing, the problem is physical.
Failed USB port
Test every USB port on the machine — back panel ports on desktops connect directly to the motherboard and are more reliable than front panel ports, which use an internal header cable that can come loose. If the keyboard works in one port but not another, that specific port has failed or its USB controller driver needs updating in Device Manager.
Wireless receiver not responding
For 2.4GHz wireless keyboards, the USB receiver occasionally loses its pairing state after a Windows update or power cycle. Unplug the receiver, wait 10 seconds, replug it, then press the keyboard’s pairing button — usually on the underside — to re-establish the connection. Most manufacturers sell replacement receivers if the original is lost; check your keyboard brand’s support page for your exact model.
Physical damage on the cable
Run your fingers along the full length of the USB cable looking for kinks, cuts, or damage near the connector ends. A cable pinched under a desk leg or bent repeatedly at the same point may have broken internal wires while the outer insulation looks fine. Test with a known-working USB cable before concluding the keyboard itself is faulty.
Keyboard works on another PC — what that tells you
If the keyboard works perfectly on another machine, the problem lives in your original PC rather than in the keyboard hardware itself.
A keyboard that types normally on a second PC confirms the hardware is intact. Every fix from this point is in your Windows installation: driver reinstall, accessibility settings, Fast Startup, or a conflicting background application.
If the keyboard also fails on the second PC, the keyboard itself is faulty — replacement is the path forward, not more software diagnosis.
Quick hardware isolation sequence
- Test the keyboard on a second PC — confirms hardware vs. Windows issue
- Test a different keyboard on your original PC — confirms whether the USB port and Windows driver work
- If the second keyboard also fails on your PC, the USB controller or Windows installation needs repair
Keyboard not typing in one specific app
When the keyboard works everywhere except one application, that application is the cause — not the keyboard or Windows.
Keys that register in the keyboard tester but not in an app point to software rather than hardware. Open the keyboard tester online and confirm every key registers there. If they do, the app is intercepting or blocking keyboard input before it reaches the text field.
In games: Anti-cheat software (Easy Anti-Cheat, BattlEye, Riot Vanguard) intercepts keyboard input at kernel level. A game blocking typing in its menu may have a conflicting key binding or an anti-cheat conflict — check the game’s key binding settings.
In remote desktop and VMs: RDP sessions and virtual machines capture keyboard input at the host level. Some key combinations don’t pass through to the remote or virtual environment. Check the remote desktop client’s keyboard pass-through settings.
In browsers: A browser extension or the browser’s built-in shortcut system may be consuming specific keystrokes before they reach the text field. Test in incognito mode with extensions disabled to isolate whether an extension is the cause.
Full hardware test before giving up
Before concluding any keyboard needs replacement, confirm the hardware is the actual failure point rather than a Windows setting.
Open the keyboard tester online and press every key. Keys that register in the tester but won’t type in Windows have a software problem — every fix is a Windows setting or driver. Keys that stay dark in the tester have a hardware problem — that key or the whole keyboard isn’t sending signals, and no Windows fix restores electrical failure.
If the keyboard fails on a second PC too, the keyboard hardware is likely faulty, and effort is better spent on a replacement than on more troubleshooting.
For laptops, run the laptop keyboard test to document exactly which built-in keys are registering before escalating to a repair. A full row of failed keys points to a ribbon cable issue — not a software fix — and the test result gives any repair technician a clear map of which section has failed.
For a complete Windows-specific diagnosis flow covering driver reinstall, USB power management, Safe Mode testing, and SFC repair, the keyboard troubleshooter Windows 10 and 11 guide works through every step in order.
Confirm which keys are registering before changing anything
Open the keyboard tester online and press every key before touching drivers or settings. Keys that light up have working hardware — the fix is in Windows. Keys that stay dark have a hardware failure — software fixes won’t help. That single test guides every step that follows and prevents spending time diagnosing the wrong problem.
Frequently asked questions
The three most common sudden failures during active use: a USB connection worked loose from movement, Filter Keys activated because Shift was held for 8 seconds, or a Windows driver crashed and needs a restart to reload. Unplug and replug the keyboard first, then check Settings → Accessibility → Keyboard to confirm Filter Keys is off. If neither restores typing, restart Windows — a driver crash clears on reboot in most cases.
Your user profile has a setting interfering with keyboard input — most commonly Filter Keys or Sticky Keys enabled in your accessibility settings, or a startup application capturing keyboard input before Windows passes it to the desktop. Sign in, open Task Manager → Startup tab immediately, and disable all third-party startup programs. Restart and test whether the keyboard works before any startup programs have loaded.
Your active keyboard layout switched to a different language. Press Win + Space to cycle through installed layouts until you return to the correct one, or go to Settings → Time & Language → Language & Region and remove extra layouts. The keyboard hardware is working correctly — Windows is translating keypresses through the wrong character map.
Yes. A wireless keyboard with a nearly depleted battery occasionally drops individual keystrokes or registers them with a delay rather than stopping entirely — the radio signal is too weak for reliable transmission but still fires intermittently. Replace the batteries with fresh ones and retest. If the issue disappears, the batteries were the entire problem.