Try this first: restart the laptop, then check whether the dead keys also fail in the BIOS screen or an online keyboard tester. If keys work there but not in Windows, it's software, and a driver reinstall or a Filter Keys setting usually fixes it. If they fail everywhere, the keyboard hardware or its cable needs attention.
Is it a few keys or the whole keyboard?
The pattern of failure tells you most of what you need to know. Open Notepad and press each dead key, then try an online key tester or the Windows on-screen keyboard (Windows key, Ctrl and O together) to see whether the laptop registers anything at all. Write down which keys fail, because the shape of the dead area is a clue.
- One or two random keys: debris under the keycap, a worn switch or a cracked keycap clip.
- A whole row, column or block of keys: a broken trace in the keyboard's flexible membrane, or a loose ribbon cable.
- The entire keyboard, but the touchpad works: a ribbon cable that has come loose or a driver problem.
- Keys that type the wrong characters or repeat: Sticky Keys, Filter Keys, a wrong keyboard layout, or liquid residue.
- Keys that work and stop at random: a failing cable, heat, or early signs of liquid damage.
What should you try first?
Begin with the free, reversible checks. They resolve a surprising number of cases, and they won't void any warranty. Do them in this order.
- Restart fully. Choose Restart rather than Shut down, because Fast Startup can preserve a glitched state across a normal shutdown.
- Check Fn lock and Num Lock. A locked Fn key makes the top row behave as media keys, and Num Lock can turn letter keys into numbers on compact laptops with an embedded keypad.
- Turn off Filter Keys and Sticky Keys. In Settings, under Accessibility, open Keyboard and switch off Filter Keys. It ignores brief or repeated presses, so keys seem unresponsive.
- Check the language and layout. A different input language can make symbols appear in the wrong place. Press Windows key plus Space to switch.
- Test with a USB keyboard. If an external keyboard works fine, Windows is healthy and the built-in keyboard has the fault.
- Reinstall the keyboard driver. In Device Manager, expand Keyboards, uninstall the entry for the built-in keyboard, then restart. Windows reinstalls it automatically.
Next, look at the BIOS. Restart and tap the BIOS key shown at the logo, often F2, F10 or Delete. If the keys work there, Windows is the issue. If they fail in the BIOS too, the keyboard or its connection is at fault.
Can cleaning fix sticky or dead keys?
Often, yes, when the cause is dust or crumbs. Shut the laptop down and unplug it. Tilt the laptop at roughly 45 degrees and blow short bursts of compressed air across the keys from one side to the other, holding the can upright. Tap the laptop gently over a clean cloth so loosened debris falls out. A soft brush helps on the gaps between keys.
For a sticky key after a drink spill, don't flood the keyboard with cleaner. A cotton bud lightly dampened with isopropyl alcohol can clean the edge of a keycap, but liquid that has gone beneath the keys can reach the board and keep corroding. If you suspect a spill, read our guide to keyboard water spills and power the laptop off.
Avoid pulling off keycaps unless you know your model. The small plastic clips under laptop keys are fragile, and the flat scissor-switch mechanism breaks easily if it's lifted at the wrong angle. A key you've broken costs more than the key you were trying to clean.
What about MacBook keyboards?
MacBooks made from roughly 2016 to 2019 use a low-profile butterfly mechanism, and one speck of dust can make a key stick, repeat or fail. The air-spray method above helps, but Apple's own cleaning advice for those models is specific, so check the support page for your exact model. Later MacBooks returned to a scissor mechanism that tolerates dust better. If a MacBook key fails after cleaning, the fix is a keyboard replacement, which is an involved job because the keyboard is built into the top case. See our MacBook keyboard replacement page for what's involved.
When does the keyboard need replacing?
Replace the keyboard when a block of keys is dead across a row or area, when keys fail in the BIOS, when liquid has dried underneath, or when the cable and connector are fine but keys still don't register. A keyboard is a consumable part. The membrane under the keys can crack from wear, heat and years of typing, and no amount of cleaning will repair a broken trace.
Repair is more involved on some laptops than others. On many business laptops, the keyboard comes out after removing screws from the base and is quick to swap. On many thin ultrabooks the keyboard is riveted or heat-bonded into the top cover, so the entire palm-rest assembly is replaced. That is the biggest factor in the price difference between models. Indicatively, a Windows laptop keyboard replacement is ₹1,799 – ₹4,499 (₹3,499 – ₹6,999 for a backlit or palm-rest unit), and a MacBook keyboard is ₹6,999 to ₹16,999. You can read more about the job in our keyboard replacement cost and process guide, or see the laptop keyboard replacement service.
What if the keys work but the backlight or number pad doesn't?
A working keyboard with a dead backlight is a separate fault, often a setting or a failed backlight strip. Press the keyboard backlight key (often Fn plus a function or space key) to cycle the levels. On some models, the backlight must also be enabled in the manufacturer's app. If the number pad alone fails, try Num Lock first. Our keyboard backlight repair page covers hardware faults.
What can you do while you wait for a repair?
You can keep working with an external USB or Bluetooth keyboard, which costs very little and avoids stress on a damaged internal keyboard. The Windows on-screen keyboard works for the odd password. Don't keep pressing hard on keys that fail, because it can worsen a cracked membrane and, in a liquid-damaged keyboard, spread corrosion. If the dead keys include Ctrl, Alt or Delete, use a USB keyboard for everything until the repair is done.
Frequently asked questions
Why do some laptop keys stop working suddenly?
Sudden failure of a few keys usually comes from debris, a worn keycap mechanism or a damaged membrane trace. If a block of keys fails together, suspect the ribbon cable or membrane rather than individual switches.
Can I replace one broken key instead of the whole keyboard?
Sometimes. Individual keycaps and clips are available for some models, but not for all. Where the clip underneath is broken or the membrane has failed, a full keyboard replacement is the dependable fix.
My laptop keyboard types wrong characters. Is it broken?
Probably not. Check the input language, Num Lock and Fn lock first, then try a different keyboard layout. A persistent fault after those checks may mean a failing membrane.
Should I clean or replace a keyboard after a spill?
Have it inspected first. Residue under the keys keeps corroding, and the liquid may have reached the board. Cleaning alone often isn't enough after a sugary drink.
Tired of working around dead keys? Book a free pickup and we'll check the membrane, cable and connector before suggesting a replacement. You can also WhatsApp your laptop model to +91 74997 61196 to find out how your keyboard is fitted.
