How to Replace Missing Keys on a Mac Laptop Keyboard

Note the model of your laptop to get the appropriate keys. Powerbooks, for example, have a variety of models, including the Wallstreet, Lombard and Pismo, the older black models. When the Powerbook changed to a silver color, the models included the Titanium---which has a black keyboard---and Aluminum.
Find a website that sells individual keys (see Resources) or eBay and order the appropriate keys.
Remove bad keys if they still are attached to the keyboard. All the keys are snapped into place, so just pull a key up to remove it. It will unsnap from what Apple calls the scissor or plunger. If the scissor is intact, but the key is missing, a new key will snap on over the scissor by pushing it down until it clicks.
Make sure your support scissors are still intact, as you will need them to place your key. Most individual keys come with the scissor part, so you can replace it at the same time as the key. Push each side of the scissor under the metal hook, one at a time. The scissor halves will then extend upward on either side. Whether you are replacing an old key or placing a new one, the scissors must be hooked into the old supports already found in the keyboard base. Use tweezers to steady the support scissor and connect it to the already-in-place scissor on the Mac keyboard.
Push the key down gently but firmly until it snaps into place.
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