Symptoms
- Common shortcuts like copy/paste or Alt+Tab don't work
- Shortcuts work in some apps but not others
- Shortcuts stopped working after installing new software
- Modifier keys (Ctrl, Alt, Shift, Windows/Command) seem stuck or unresponsive
Likely causes
- CommonA background app has taken over or conflicts with the shortcutSome software remaps common shortcuts globally, which can override the system default.
- CommonA modifier key is stuck or not registering properlyA single stuck key can break many shortcuts that depend on it.
- PossibleAccessibility settings (like Sticky Keys or Filter Keys) altering expected behaviorThese features change how key combinations are interpreted.
- PossibleKeyboard driver issue affecting how key combinations are readLess common, but can affect multiple shortcuts at once.
What to do
- Test the specific modifier keys individually (Ctrl, Alt, Shift, Windows/Command) to see if one of them isn't registering.
- Close recently installed software one at a time to identify if one is intercepting shortcuts.
- Check accessibility settings for Sticky Keys, Filter Keys, or similar features and disable them if not intentionally set.
- Update the keyboard driver from the manufacturer's site.
- Test the same shortcuts on an external keyboard to isolate whether it's a physical key issue.
- Restart the laptop to rule out a temporary conflict or stuck process.
Tools and parts
- External keyboard (for testing)
When to call a pro
If a specific modifier key is confirmed physically unresponsive on the built-in keyboard, a technician can address that key's switch or the keyboard assembly.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.