How to Reattach Keys to a MacBook (3 Steps)

Remove the plastic connector from the back of the key that has fallen off. The reason keys come off of keyboards is because the connectors have somehow wiggled out of place, allowing the key to fall off. Use a small screwdriver to pry to connector off of the back of the key.
Attach the connector back on the keyboard. The side of the connector with the two small holes in the corners is the left side of the connector. This will give you some orientation on how to place the connector on the keyboard. Place the connector on the keyboard so the small holes are on the left side. You will notice that these small holes line up with two metal tabs on the keyboard. Use the screwdriver push connector until the holes connect with the metal tabs.
Place the key back on the keyboard. Gently apply pressure from right to left until the key is back on the keyboard and snaps it into place. You should hear and feel the key connecting back to the keyboard. Type with the key to make sure it works properly and is fully attached.
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How to Replace the Logic Board in a Macbook Pro

Turn your Macbook Pro off and flip it over. Remove the battery from its bay by pressing the two catches on either side of the battery compartment (in the middle of the bottom of your Macbook Pro); then lift out the battery.
Remove the three screws at the bottom of the battery compartment with the Phillips-head screwdriver and lift out the compartment.
Turn your Macbook Pro right-side up and remove the two screws on each corner of the back of the computer. Then remove all the screws on each of the remaining three sides of the computer. Gently lift the top of the Macbook Pro up until the housing comes away from the computer.
Lift the keyboard up by its corners and away from the body of the computer to reveal the green logic board. Detach the orange ribbon connecting the keyboard by gently pulling it loose from the logic board. Place the keyboard aside.
Remove the two wires connected to the sides of the logic board from the computer by inserting the tip of your flat-head screwdriver under the wire and gently lifting upward.
Remove the yellow tape from the top of the logic board with the tip of your flat-head screwdriver. Disconnect the thick gold video cable from the side of the logic board.
Remove the 10 screws on the logic board (eight on the sides and two in the middle) with your Phillips-head screwdriver.
Gently lift the logic board up and remove the power cable from the left side of the logic board by gently pulling it out. With the last connection unplugged, remove the logic board and replace with the new one (available at your Apple retailer or online). Reassemble your Macbook Pro in the reverse order you took it apart.
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How to Remove the Keyboard in a MacBook (8 Steps)

Put the soft cloth down on a table. Close the lid of the MacBook and place it face down on the soft cloth. Turn the lock on the bottom panel to release the battery. Slide the battery out of the bottom and put it aside.
Use the Phillips jeweler's screwdriver to remove the three screws running across the long part of the 'L' shaped bracket inside of the battery compartment. Lift the 'L' shaped bracket up and out of the battery compartment.
Use the Phillips jeweler's screwdriver to remove the two screws, one on each side, at the end where the battery cable is located inside the battery compartment.
Lift up on the three metal levers in the battery compartment and remove the screws beneath each using the Phillips jeweler's screwdriver. Use the Phillips jeweler's screwdriver to remove the 2nd, 4th, 7th and 9th screws in the front of the battery compartment, counting from the left side.
Use the Phillips jeweler's screwdriver to remove the three screws from the bottom of the case; two at the back edge and one in the middle. Use the Phillips jeweler's screwdriver to remove the two screws on the outside of the case next to the battery compartment.
Use the Phillips jeweler's screwdriver to remove the two screws on the side of the case next to the optical drive. Remove the four screws from the back of the MacBook where the hinge is with the Phillips jeweler's screwdriver.
Turn the MacBook right side up and put it down on the soft cloth. Open the lid. Grab the back corners of the top plate of the MacBook from both sides. Wiggle the top plate loose.
Grab the top plate from both edges at the front. Slowly lift it up until you see the track pad cable's connector on the case. Pull the connector off the case. Remove the top plate and the keyboard from the case of the MacBook.
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