How to Replace the Motherboard on a MacBook

Power down the Macbook. Turn the device over. Take out the battery from the bay. This is done by the pressing of the two catches on the battery's side. Now pull up on the battery. Use the Phillips screwdriver to take out the screws on the bottom of the battery compartment. Remove the compartment.
Flip the Macbook back to the right-side position. Take out the screws on the corners of the rear of the device. Now remove the remaining screws on the three sides of the Macbook. Lift the top of the computer up. The housing will now come off the computer.
Raise the keyboard. Move it away from the computer's body. You will now see the motherboard. Disconnect the orange cord that connects the keyboard to the motherboard. Move the keyboard to one side. Take off the two wires that connect the side of the motherboard to the computer.
Use the screwdriver to take off the yellow tape located on the motherboard. Detach the gold video cable from the motherboard. Utilize the screwdriver to take off the screws on the motherboard.
Raise up the motherboard. Pull out the motherboard's power plug. Now replace the motherboard with the brand new unit.
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How to Hard Reset a Mac Mini Computer (9 Steps)

Locate the power button, installed on the left side of the rear panel.
Depress the power button until the computer powers down.
Press the power button again to restart the computer.
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How to Repair the Power Port on an Apple Laptop

Remove the battery. Turn the laptop upside down and press the two buttons below the battery. Remove the memory cover by unscrewing the three screws that the removed battery exposes. Remove the two screws against the opposite wall of the battery slot, as well as the Torx screws that are exposed directly beneath the battery. Additionally, remove the hinge screws at the edge of the laptop where the screen is connected. Remove the screws on the port side of the computer. This is the side opposite the power port. Remove the screws at the rear as well as the screws on the power port side of the laptop. You now should have removed all of the screws exposed by removing the memory door and the battery as well as all of the screws exposed externally.
Slide your finger around the plastic panel near the keyboard. The entire top of the laptop below the screen should pop off. Continue to gently pry around the edges as it comes up. Remove its connections to the motherboard.
Remove the fan by disconnecting it from its various connectors. If the laptop is oriented as it would be during use, the fan will be located in the upper left-hand corner. Remove the two screws holding it in place. This will expose the Airport card. Detach the antenna cables that are connected to it. Remove the single screw that holds it in place, and lift the airport card out of the computer gently.
Disconnect the speaker from the left IO board. It's located below where the Airport card was. Remove the speaker. This is in the upper left hand corner of the laptop if it's oriented normally. Disconnect the power cable on the IO board, unscrew the remaining screws holding it in place and remove it.
Insert the new left IO board, and reverse the previous steps.
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