MacBook Air M4 Keyboard Not Working

⌨️ Step 1: Clean the Keyboard

Dust and debris under keys are the most common cause of unresponsive keys:

1. Shut down your MacBook Air completely
2. Use compressed air (canned or electric air duster) to blow out debris
3. Angle the MacBook at 45 degrees and spray short bursts of air along the keyboard rows
4. Do this for 30-60 seconds, working from left to right
5. Wait 30 seconds for any dust to settle
6. Power back on and test the problem keys

Pro tip: Don't shake the MacBook while spraying — gravity helps debris fall out more effectively with the machine tilted.

🔧 Step 2: Reset the Keyboard via SMC

The System Management Controller (SMC) controls keyboard input — resetting it often fixes key issues:

1. Shut down your MacBook Air
2. Wait 30 seconds
3. Power back on normally
4. Immediately hold Control + Option + Command + Power keys simultaneously for 10 seconds
5. You might see the screen flash or brightness change — that's the SMC reset
6. Release and let the Mac boot normally
7. Test the keyboard

🔑 Step 3: Check Keyboard Settings

Some macOS settings can affect keyboard responsiveness:

1. Apple Menu → System Settings → Keyboard
2. Check Key Repeat slider — move it to a normal position (not too fast, not too slow)
3. Check Delay Until Repeat slider — set to a reasonable value
4. Disable Caps Lock Delay if enabled (can cause stuck capslock)
5. Check Keyboard Layout — make sure it's set to your correct keyboard (e.g., "U.S." not another language)
6. Go to Shortcuts tab and look for any problematic key assignments

🚀 Step 4: Safe Boot Diagnostics

Booting in Safe Mode helps determine if software is causing the issue:

1. Shut down your MacBook Air
2. Power back on and immediately hold Shift key
3. Continue holding Shift until you see "macOS Loading" or the login screen (this is Safe Boot)
4. Log in and test your keyboard
5. If the keyboard works fine in Safe Boot, it's a software issue — third-party software is interfering
6. If the problem persists in Safe Boot, it's a hardware issue

🔄 Step 5: Update macOS

Apple releases keyboard driver updates:

1. Apple Menu → System Settings → General → Software Update
2. Install any available updates
3. After updating, restart and test

🛠️ Step 6: Hardware Repair Needed

If you've made it here, the keyboard likely needs professional repair:

• Stuck key mechanism: The scissor switch or key mechanism is physically stuck — requires keyboard replacement or individual key repair
• Water damage: Spilled liquid under keys causes electrical shorts — requires professional cleaning or keyboard replacement
• Broken key switch: The internal switch mechanism failed — requires replacement
• Logic board keyboard controller failure: Less common, but the keyboard processor on the logic board could be dead

Cost estimate: MacBook Air M4 keyboard replacement runs $150-350 depending on whether it's the entire keyboard or a few keys.