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SAFE MODE FOR MAC SIERRA HOW TO
SAFE MODE FOR MAC SIERRA PORTABLE

This won’t doesn’t make a lot of sense, but it sometimes works: boot into Verbose Mode.

Often replacing a hard disk is in order, some users are comfortable doing it themselves otherwise you might want to contact an Apple Support center for official assistance in replacing the drive or diagnosing whatever other system issue persists. If that’s the case, be sure you backup your data from the Mac, and then consider using Apple Hardware Test to diagnose any issues. If the drive is showing many errors, particularly errors that can’t be repaired, you may have an underlying issue or drive failure impending.

Select the hard drive and then go to the “First Aid” tab and choose to run First Aid and repair the drive.

Choose “Disk Utility” from the list of options at the Utilities screen.

Reboot the Mac and hold down Command+R to boot into Recovery Mode.

If possible, try to repair the boot disk through Disk Utility by entering into Recovery Mode:

SAFE MODE FOR MAC SIERRA HOW TO

Hold down the Shift+Control+Option+Power button at the same time for a few seconds, then release all keys concurrentlyįor other hardware, you can learn how to reset SMC on Macs here.

Shut down the computer and connect it to your MagSafe adapter and a wall outlet as usual.

SAFE MODE FOR MAC SIERRA PORTABLE

Since the white screen problem seems to occur mostly on portable Macs, we’ll focus on resetting SMC on modern MacBook Pro, MacBook, MacBook Air models: At this point it should no longer get stuck on a white screen. Reboot the Mac, the moment you hear the boot chime, hold down the Command+Option+P+R keys concurrently, when you hear a second boot chime you can release the keys, the NVRAM has been resetĪfter NVRAM has been successfully reset, go ahead and let the Mac boot as usual.

Often simply resetting NVRAM / PRAM is sufficient to remedy a white screen Mac issue: You can learn more about Safe Boot mode on Mac here if interested. If the Mac works fine in safe mode, try rebooting again as usual (without holding down Shift) and see if it works as usual, it just might. Reboot the Mac as usual, then immediately hold down the SHIFT key, release the SHIFT key when you see the  Apple logo and progress barĪttempting a Safe Boot is easy and it can remedy some simple issues with a Mac getting stuck on a white screen during boot.This is quite easy simply reboot into Safe Mode on the Mac with a properly timed shift key press. Not all steps may be required to resolve the problem, you may be able to simply reboot into Safe Mode and reset NVRAM and fix the white screen issue, for example. There are vairous potential causes for a white screen to appear on a Mac during startup, so we’re going to cover a wide range of troubleshooting tips that may resolve the issue. To be clear, what we’re describing here is a Mac that is stuck on an all white screen with no logos, no progress bar, nothing, it’s just a blank white display. If you find your Mac is stuck on a white screen during boot and is not powering on as expected, read on to troubleshooting and learn how you might be able to fix this issue.