Your laptop's power button sits directly on top of a device called a power button board. This is a small circuit board where all power and control buttons interface with your laptop's motherboard. The repetitive use of the power and control buttons can damage the power button board. Repairing your power button means removing and replacing the power button board, which requires partial disassembly of your laptop.
Power down your laptop. Unplug the AC power adaptor and all external devices from the computer. Close the laptop's LCD panel and place the laptop face down. Rotate the laptop so the front opening edge is facing you. Remove the battery pack from its compartment on the laptop's bottom side.
Flip the laptop over, and pull open the display panel as far as possible. Use a thin, flathead screwdriver to pry the keyboard cover from the laptop. The keyboard cover is the plastic piece situated above the keyboard assembly that houses the power button board.
Lift the keyboard cover out of the laptop slightly, and disconnect the cables extending from the power button board to the motherboard. Remove the keyboard cover from the laptop.
Place the keyboard cover face down on a flat surface. Remove the Phillips-head screws fastening the power button board to the cover, and remove it. If your speakers are situated inside the keyboard cover, disconnect the speaker cables from the power button board before removing it.
Place the new power button board inside the keyboard cover. Align the screw holes on the button board with the holes on the keyboard cover. Replace the Phillips-head screws fastening the button board to the keyboard cover. Reconnect the speaker cables to the button board, if necessary.
Reconnect the power button board's main cable to the motherboard. Place the keyboard cover back inside the slot above the keyboard assembly. Press down on the cover until it snaps into place. Replace the battery pack and reconnect all cables.
Wear an antistatic wrist strap while working on your laptop to prevent electrical damage caused by static electricity. Or, you can touch an unpainted metal surface to discharge static electricity.