_:n7a135b992d124754a29c89d3cfbc3759xb28
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"Reset the System Management Controller (SMC). If there's something wrong with the SMC, it could affect your Mac's power settings, battery, display, and general hardware. The steps are different depending on your computer:\n\nAll Mac computers with Apple Silicon chip:\nPlug the Mac into a power outlet.\nRestart the Mac.\n\n\n2018 MacBook Air and Pro:\nPress and hold these keys at the same time: Control + Option + Shift\n\nIn 7 seconds, continue holding those three keys and also press and hold the Power button.\nRelease all keys after 7 more seconds.\nWait about 10 seconds and then try powering on your Mac.\n\n\nAll Mac desktop models:\nUnplug your Mac's power cord.\nAfter 15 seconds of remaining unplugged, plug it back in.\nWait 5 seconds and power on your Mac.\n\n\nAll other Mac notebooks with a non-removable battery:\nPress and hold these keys at the same time: Control + Option + Shift.\nPress and hold the Power button as well.\nContinue holding down all keys for 10 seconds and then release them all at once.\nPress the power key to turn on your Mac.\n\n\nAll other Mac notebooks with a removable battery:\nPress and hold the Power button for 10 seconds to make sure the Mac is powered off.\nRemove the power cable.\nRemove the battery from the laptop.\nWhile the battery is out, press and hold the power button for 5 seconds.\nPut the battery back into the Mac and try powering it on."
<https://www.wikihow.com/Turn-On-a-Mac-Computer>