Ensure that the strip of conductive tape connecting the touchpad housing and PCB is firmly adhered to the copper pad on the PCB.Use a can of compressed air to blow out any unwanted materials from under the keys.
Under the heading Explore all settings, click on Make the keyboard easier to use. Now untick the checkbox corresponding to Turn on Filter Keys. If the power adapter is plugged into a surge protector or power strip, make sure the power strip is turned on. Use a voltmeter to verify that the power adapter is outputting 19V. The hole is on the bottom of the laptop, near the middle two screw holes. Consider purchasing a new battery and following our battery replacement guide on iFixits website. Locate the internal battery reset hole on the bottom of the laptop, near the two screw holes in the middle. After 5 minutes, plug back in the AC power adapter and attempt to power on the computer. Reinsert the battery, plug in the AC power adapter, and attempt to turn on your laptop.
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