[Solved] How to fix iMac/MacBook Air/Pro won't turn on/start up/boot?

Updated by Admin to Mac Data Recovery on June 20th, 2019

I have a constant black screen on my MacBook Pro. Twice within the last six months I have inadvertently let the battery drain completely. Thinking this might be the problem, I replaced the battery and did an SMC reset. The power cord changed colors like it's supposed to and the battery seems to be charging but it still won't turn on. About a week after I replaced the battery it came on by itself. I was able to login , access files and mail and it seemed to work just fine. Foolishly, I logged out and turned it off and now I'm stuck with a black screen again. Any help would be greatly appreciated, thank you!

Common scenarios of 'iMac/MacBook won't turn on'

My Mac stuck on boot screen
My iMac won't boot past Apple logo
My MacBook stuck on loading screen
My MacBook Air stuck on login screen
My iMac stuck on black loading screen
My MacBook Air won't turn on black screen
My MacBook Pro won't turn on but is charging
My Mac computer won't start up after macOS High Sierra update
My Mac computer won't boot after macOS Mojave update
My Mac computer won't turn on after macOS Catalina update
My Mac computer won't turn on after power outage

Solution 1: Check the display

Please check if the display is ok. If you are using an external display, please make sure the video cable is seated properly at both the display and the Mac ends of the cable. Check the power cable as well. If it is loose, you need to reconnect the cable firmly at both ends.

Solution 2: Check the charging and power or reconnect the battery connector

Please check the charging and power for your iMac/MacBook when it won't turn on. Yes, you may think it is all working and nothing is wrong, but I fixed an older MacBook not turning on by switching to another charger.

1. Borrow a second charger from a friend and see if it works.

2. Make sure you are using the right charger for your iMac/MacBook.

3. Disconnect and reconnect the battery connector to see if iMac/MacBook can turn on.

4. Make sure that your power cable is undamaged and securely plugged into your Mac computer and a working electrical outlet. If you're not sure about the outlet, test it with a lamp or other device.

Solution 3: Reset SMC

SMC is the System Management Controller which handles a lot of tasks (Such as power button, waking the MacBook Pro) for your Mac. If your MacBook Pro is new enough that you cannot remove the battery, please reset the SMC with following steps.

Step 1: Make sure your Mac is off, it isn't an issue if it won't turn on.

Step 2: Hold Shift + Control + Option and hold the power button for 10 seconds.

Step 3: After 10 seconds release the keys, wait a second, press the power button and see if the Mac computer can turn on.

Solution 4: Uninstall RAM or a Secondary Drive

If you opened up your Macbook Pro to upgrade RAM or add a new hard drive, that may be the problem. In this situation, uninstalling RAM/new hard drive and putting the old RAM/hard drive can solve the issue. Although tt is an annoying job, but it ss a good way to rule out something simple.

Solution 5: Run First Aid in recovery mode

If the only way that you can start up is from macOS Recovery mode, the operating system on your startup disk is not usable again. In this situation, Disk Utility built-in macOS recovery mode is a chance to repair the boot issue.

Step 1: Turn on Mac computer by pressing Power button.

Step 2: Press and hold Command+R keys immediately upon hearing the startup chime. Hold the keys until you see the Apple logo or a spinning globe.

Step 3: Select Disk Utility from macOS Utilities in Mac recovery mode.

Mac recovery mode

Step 4: Select the corrupted Macintosh HD from the left panel of Disk Utility.

Step 5: Click "First Aid" button on the top of Disk Utility window.

Run First Aid in disk utility

First Aid is a utility built-in the Macintosh operating system for checking and repairing file system errors on Mactintosh HD, external hard drive, flash drive, SD card, memory card, USB drive, etc,.

Step 6: Click "Run" button to start the repair on the Macintosh HD.

If Mac Disk Utility failed to repair the corrupted Macintosh HD, you need to reinstall macOS or restore from a backup.

Solution 6: Data recovery

After iMac/MacBook won't turn on, the important thing is the data stored in Macintosh HD. If the 'iMac/MacBook won't turn on' issue cannot be solved, you have to rescue the data from failed Mac computer.

M3 Mac Data Recovery is a professional Mac data recovery software which can recover deleted files emptied from Trash, recover data from formatted drive, recover data from unreadable drive, recover data from unmounted drive, recover data from corrupted drive, recover data from deleted/lost APFS partition, recover data from encrypted APFS drive, recover data after iMac/MacBook won't start up, etc.

Step 1: Create M3 Mac Data Recovery bootable media

1) Download, install and launch M3 Mac Data Recovery software on another Mac computer.

2) Click M3 Data Recovery on menu bar and select "Create Boot Drive".

3) Insert a blank USB drive into Mac computer and click "Make bootable".

4) The USB drive will be erased and then M3 Mac Data Recovery starts to create a bootable media.

Step 2: Recover data from unbootable Mac computer

1) Insert M3 Mac Data Recovery bootable media into the failed Mac computer and then press the Power button and Option key (⌥) to start the unbootable Mac computer up.

If M3 Mac Data Recovery bootable media fails to start up your unbootable computer, please install macOS on an external hard drive and then boot your failed Mac computer from external hard drive.

2) After M3 Mac Data Recovery is loaded, please select the failed Macintosh HD and click Next to start the scan.

Mac data recovery software

If Macintosh HD is APFS and encrypted APFS file system, please click "Find Lost APFS Partitions" to recover data from APFS drive.

3) M3 Mac Data Recovery software is scanning the data from the failed Macintosh HD.

Scan lost data from corrupted drive

4) After the scan completes, please select the found files you want and then click Recover to save them.

Recover data from failed Macintosh HD

After data recovery is successfully done, you can restore from Time Machine Backup or reinstall macOS.

Solution 7: Restore from Time Machine Backup

If you have a backup of your macOS system, you can restore your macOS system from Time Machine backup with following method:

Step 1: Make sure that your Time Machine backup disk is connected to your Mac computer.

Step 2: Boot your Mac into Recovery Mode.

Step 3: From the macOS Utilities menu, select "Restore From Time Machine Backup" and click Continue.

Step 4: Select your Time Machine backup disk as the restore source and then click Continue.

Step 5: Select a backup and then click Continue.

Step 6: Select the hard disk as the restore destination and then click Restore to continue.

Step 7: Select the hard disk as the restore destination and then click Restore to continue.

Step 8: Restart your Mac computer when the restore is done.

Solution 8: Reinstall macOS in recovery mode

Before reinstalling macOS, please make sure you have recovered all the data from Macintosh HD.

Step 1: Boot your Mac into Recovery Mode.

Step 2: From the macOS Utilities menu, select "Reinstall macOS" and click Continue.

Step 3: Follow the instructions to reinstall macOS.

Solution 9: Erase and then reinstall macOS

The last chance is to erase the drive and then reinstall macOS, but before that, please make sure you have recovered all lost data from unbootable Mac computer.

Step 1: Boot your Mac into Recovery Mode.

Step 2: From the macOS Utilities menu, select "Disk Utility" and click Continue.

Step 3: Select the unbootable Mac hard disk.

Step 4: Choose Erase, complete name, format, scheme, and then click Erase to reformat it.

Step 5: Return to macOS Utilities window in Recovery Mode, and select "Reinstall macOS".

Step 6: Choose the erased Mac hard disk and follow the wizard to complete the installation.

Step 7: Reboot your Mac and then check if your Mac computer can boot.

Solution 10: Take your iMac/MacBook to Apple store

If none of the above solutions helped, you will need to take your iMac, MacBook Air or MacBook Pro to an Apple store or a local repair shop to start working on a DIY solution to fix your iMac/MacBook that won't turn on.