What to Do When Your Mac Wont Turn on
Macs aren't immune to bug. Your Mac may sometimes not respond to the Power button at all, or macOS might crash or neglect to get-go up properly. Hither's what to do if your Mac won't plough on.
The get-go steps here presume your Mac just isn't responding when you press its power push button. If it's responding simply failing to boot upward normally, curlicue down to the Recovery Way sections.
Ensure It Has Power
Ensure your Mac is plugged into a power source. Endeavor swapping out the charger or ability cablevision, or using a unlike power outlet. The charger itself may be damaged. If you lot're using a MacBook and its battery is completely expressionless, you may need to wait a few moments after plugging information technology in before turning information technology on. It won't necessarily boot immediately the moment later you plug it in.
Cheque the Hardware
Assuming y'all're using a Mac desktop, bank check that all its cables are correctly seated. For instance, if it's a Mac Mini, ensure the video-out cablevision is connected securely to both the Mac Mini itself and the brandish. Try reseating all the cables—unplug them and and then plug them back in—to ensure they're securely connected.
If yous've recently opened up your Mac and fiddled with its hardware, that could have caused the problem. For case, if you installed RAM or swapped out a difficult drive, you lot may want to try swapping dorsum in the old hardware or just ensuring those components are securely seated in your Mac.
If all else fails, effort unplugging all unnecessary peripherals before trying to boot your Mac.
Perform a Power-Cycle
If your Mac is stuck in a frozen state and non responding to power button presses, yous can fix it by cutting the power to it and forcing it to restart.
On a modern MacBook without a removable battery, press the Power button and agree it downwardly for 10 seconds. If your Mac is running, this will forcibly cut the power to information technology and strength it to restart.
With Mac desktops (iMac, Mac Mini, or Mac Pro), unplug the power cable, go out it unplugged for ten seconds, then plug it dorsum in.
Finally, if you have an older Mac with a removable battery, shut it downward, unplug information technology, remove the bombardment, wait ten seconds, and then reinsert it.
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Reset the Organization Management Controller Firmware
In some cases, you lot may demand to reset the system management controller (SMC) firmware on your Mac. This is the last thing you should endeavour if your Mac isn't responding to power button presses at all.
On current MacBooks without a removable battery, plug in the ability cable. Printing the Shift+Control+Option keys at the left side of the keyboard and the Power button, and hold them all down. Release all four buttons at the same time, and and then press the Power push to turn the Mac on.
Mac desktops don't have batteries, so unplug the Mac'due south power cord and get out it unplugged for fifteen seconds. Plug it back in, wait v more seconds, and and so press the Power button to turn the Mac back on.
With older MacBooks with a removable battery, unplug the Mac from its power source and remove the battery. Printing the Power button and hold it down for v seconds. Release the Power button, reinsert the battery, plug in the Mac, and printing the Power button to plough it back on.
Employ Deejay Utility From Recovery Mode
Assuming your Mac is actually booting up just macOS isn't loading properly, there'due south probable a software trouble. Your Mac's disks may exist corrupted, and yous can set up this from recovery fashion.
To access recovery style, boot your Mac up. Press and hold the Control + R keys during the kick-upward procedure. You should try to press these immediately later on you hear the chime audio. Your Mac should kick to recovery mode. If it doesn't, you probably didn't printing the keys soon enough—restart your Mac and try once again.
Click the "Deejay Utility" pick, click over to the First Aid tab, and try repairing your Mac's disk. The Disk Utility performs an "fsck" (file system check) operation, so you don't need to run the fsck control manually.
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Restore From Recovery Mode
If the Disk Utility didn't work, y'all can reinstall macOS on your Mac.
Utilise the "Reinstall macOS" selection in Recovery Mode to have your Mac automatically download the latest macOS installation files and reinstall its operating system. Yous can also restore from a Fourth dimension Machine backup. If your Mac operating organisation is damaged, this will supercede the damaged software with a fresh, undamaged operating arrangement.
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If nothing here worked—if your Mac just won't turn on at all no matter how many times you press its Power push, if recovery mode isn't functional, or if macOS doesn't load properly fifty-fifty subsequently you reinstall it from Recovery Way—your Mac likely has a hardware trouble.
Assuming it's under warranty, you should contact Apple or take it to a local Apple Store to have them fix the trouble for you. Even if you don't have a warranty, y'all may desire to accept it to an Apple tree Shop or another place Apple computers are repaired and have them attempt to fix it.
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Source: https://www.howtogeek.com/217158/what-to-do-when-your-mac-won%E2%80%99t-start-up/