A lowercase L does not normally lock Windows; because Windows key + L does, first release a stuck Windows key and then disable Sticky Keys if it remains active.^1^
1. Release the Windows key
- Press and release the left Windows key several times.
- Press and release the right Windows key, if your keyboard has one.
- Press L by itself.
- If Windows no longer locks, one of the Windows keys was physically or electronically stuck.
To check without the physical keyboard:
- Select Start → Settings → Accessibility → Keyboard.
- Turn on On-Screen Keyboard.^2^
- Use the mouse to select L.
- If this types
lnormally, the physical keyboard is the likely source. - If the physical L still locks Windows, disconnect and reconnect the keyboard.
- If this types
2. Turn off Sticky Keys
Sticky Keys can keep modifier keys such as the Windows key active between keypresses.
- Open Start → Settings → Accessibility → Keyboard.
- Turn Sticky Keys Off.
- Open its additional settings and turn off Keyboard shortcut for Sticky Keys to prevent it from being enabled accidentally.
- Also turn Filter Keys off temporarily while testing. Windows places these controls under the Keyboard accessibility settings.^3^
3. Check the physical keyboard
If the problem continues:
- For a USB keyboard, unplug it, wait briefly, and reconnect it directly to another USB port.
- Remove any USB hub during testing.
- Check around the Windows keys for dirt or debris.
- If possible, test another keyboard—or test this keyboard on another computer. Microsoft recommends these checks to distinguish hardware failure from a Windows problem.^4^
If another keyboard works normally, the original keyboard likely has a stuck or failing Windows key.
Browser-specific distinction
- If pressing L displays the Windows sign-in screen, Windows is receiving Win+L; the website is not causing it.
- If only the Google or Amazon account signs out while Windows remains open, that is browser or website behavior rather than the Windows lock shortcut. Test in a private browsing window with extensions disabled to identify a browser extension or remapping utility.
Also exit any keyboard-macro, gaming-keyboard, or key-remapping software temporarily. Such software can convert L into Win+L.
References