Power off the laptop
Unplug the charger
Remove the battery if possible
Ground yourself to reduce static electricity
Identify the key type and hinge mechanism
Remove the damaged keycap carefully with a plastic tool
Remove the retainer clip if it is broken or detached
Inspect the scissor mechanism and rubber dome
Align the retainer clip with the keyboard base
Snap the retainer clip into place
Align the keycap over the retainer clip
Press the keycap down until it clicks
Test the key for proper movement and response
Replace the entire keyboard if the key mechanism is damaged or missing parts