This will boot you into a diagnostic mode. Boot up your computer while holding down Command+R (if you’re running Snow Leopard or earlier, find your OS installation disc, put it in the drive, and reboot your computer holding down C).
If you still can’t boot up OS X normally, it’s time to run Disk Utility and check out your hard drive: If not, it’s time to give the hard drive a closer look. If your Mac starts up with the safe boot, go ahead and restart the computer again and see if it boots up normally (as odd as it sounds this fixes the problem a surprising amount of the time). Do do this, start up your computer while holding down the Shift key until the Apple logo passes.
Mac black screen on startup 2017 drivers#
Safe boot makes your Mac boot up with the minimum amount of drivers needed to make it work, and it checks your hard disk in the process (it might take a bit longer to boot up). If no devices are causing problems, and your Mac still won’t boot, then it’s time to dig a little deeper. You might be able to fix it with a software update or a firmware update to the device. Head to the manufacturer’s web site and see if others are reporting the same problem.
If you figure out the problematic peripheral, it’s time to do a little research.
If one of them causes your computer to hang on the grey screen again, you’ve found your issue. You have to trial-and-error your way through to figure out which one, so connect them back into your computer one by one, and restart. If your Mac starts this way, then it’s an issue with one of those peripherals.
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