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How to troubleshoot a MacBook Air that isn't turning on?
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There are several steps you can take to troubleshoot a MacBook Air that isn't turning on. First, make sure the power adapter is properly connected to both the power outlet and the laptop. If that connection is fine, try resetting your SMC (System Management Controller). To do this, shut down your MacBook Air and then press and hold the shift+ctrl+alt+power buttons at the same time. Release the buttons while holding them down and then wait for your MacBook Air to restart. If that doesn't work, you may need to replace your battery or power adapter. If your power adapter is still functioning, try resetting your PRAM (Parameter RAM) by pressing and holding the option-command-P-R keys during the startup process. If none of the above solutions work, you may need to contact Apple support for further assistance.