If it can't find one, it attempts to use a network startup disk , if available. As startup continues, you should see a progress bar or indicator , with or without the Apple logo. This screen might alternate with a blank screen several times. If you're updating or reinstalling macOS, this stage can take much longer to complete.
The progress bar might move more slowly and pause for longer periods as installation progresses. When using a network startup disk, your Mac shows a spinning globe instead of an Apple logo. A spinning globe also appears when starting up from macOS Recovery over the Internet. As startup continues, you should see a progress bar or indicator , which might alternate with a blank screen several times. You might see a globe with an exclamation point when your Mac is unsuccessfully attempting to start up from macOS Recovery over the Internet.
Your Mac might not be able to connect to the Internet, or it might be using a network configuration that doesn't work with macOS Recovery. Try these solutions:. Enter the firmware password to continue. Enter the four-digit or six-digit passcode to continue. At the login window, enter your user account password to log in to your Mac. You might see a default desktop picture in the background, which might change to your chosen desktop picture when you select your account.
About the screens on your Mac as it starts up These are some of the screens you might see on your display during Mac startup. Blank empty screen It's normal for a blank screen to appear once or more during startup. Some Mac users have also reported that their machines stuck in reboot loop after upgrade and it happens like Mac boots into a grey screen with a loading bar or spinning wheel underneath and stuck there for sometimes and then it either shuts down or turns off the display to save power which sometime gets mistaken as powered off state.
However, if you simply need the solution to this Mac grey screen problem then you can jump over to the troubleshooting part described later in this article.
SOLVED: White Screen on Mac Computer
In most of the cases this whole story begins after you upgrade. Upgrading to new software version is obviously an exciting exercise but who knows that it will go a bit pear-shaped. When all the essential kernel extensions have been loaded by boot loader, it passes the control over to recently loaded kernel extensions and the user still sees the screen with grey Apple logo with a loading bar. At this stage the screen changes to a dark grey spinning gear right below the Apple logo. It finally mounts the System partition which is known as rooting and then passes the control over to the root system processes which show the login screen and create user interface and environment.
So that was the shortest way to understand macOS boot process. Macs can stuck at startup due to various reasons and show different screen in every situation. This problem can occur anytime not just after upgrading to macOS Sierra but due to other various reasons as well. If you are seeing a dark grey screen with a loading bar stuck at 75 percent, or a spinning gear just underneath the Apple Logo then it is most likely that your Mac is having trouble loading kexts, drivers, or other system processes. But if you are seeing a spinning globe, a prohibitory sign, a grey screen with a flashing question mark on a folder icon, or just a black or very dark display instead, then it could be a sign of corrupt macOS, startup disk failure or any other hardware issue.
This article is mainly focused on the start up problem which shows a dark grey screen with a loading bar or a spinning gear just below Apple Logo. After reading lots of discussions forum and supporting hundreds of users, here are the reasons that I have learned which causes the Mac stuck during boot. So it can be both a software or hardware related problem. Hardware related problems can be easily detected by running disk utility and hardware diagnostic test while software related issue are bit lengthy and can be fixed by following couple of troubleshooting steps.
Hardware related issue can be dangerous for your data and you should immediately attempt to back up your valuable data such as Photos, contacts, email, invoices and projects to prevent it from losing. If you have already been taking time machine backup then you need not to worry as all the data are in the backup disk and you can simply restore from time machine backup and all the issue will be fixed. You can simply skip the rest of the articles after the step that fixes your Mac. Obviously, the first troubleshooting we always do is restart the Mac and see if the issue is fixed.
One of the most common causes of a grey screen issue is a bad peripheral or its cable. A bad peripheral can make its associated driver software stuck in loop while it waits for the peripheral to respond to a command and thus can prevent a Mac from starting up, and cause it to stuck. So shutdown the computer first by holding the power button down for 10 seconds and the Mac will go off. Plug one peripheral at a time and restart again to isolate the problem. This way you can find the problematic peripherals, which will cause the Mac to stall again at start up right after connecting it.
Try without keyboard and mouse as well if the Mac does not boot even after disconnecting all other peripherals. Or you can simply replace it with a new one instead. If this step does not fix the Mac stalling at grey screen issue then move on to the next step. Safe Boot in Mac is different than Safe Boot in Windows, as it attempts to fix problems while booting. Safe Boot itself fixes hundreds of problems. So start your Mac in safe Boot mode by holding the Shift key down during boot up and and see if it boots successfully.
Once it is booted safely, make sure. Safe Boot is always slower but If the boot process still stuck or stall during booting in safe mode, then the problem is likely caused by a third-party kext and drivers, or your startup disk is damaged or malfunctioning.
If the problem persist, follow the next step to find the problematic kext or verbose. All it does is list all the extensions and drivers on the screen while they are loading during boot.
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Note down the name of the kexts, driver, or service which is the last in the list of loaded items or the one boot loader is struggling to load before the Mac goes into stall or stuck mode again. Remove the problematic kext or drivers in recovery mode.
Make sure your internet is working — try opening any webpage on other devices connected to the same network. Apple server may reject the download request if your device is connected through an unsecured public network or a network with a common default SSID name like linksys, netgear, dlink, wireless, 2wire, xfinitywifi, and default. You can also switch from wireless to a hardwired connection.
SMC manages the power specific settings and customization ranging from screen brightness levels and settings for peripheral attached to Mac to settings in Energy Saver like auto-dimming based on lighting and power sources, sleep when idle, screen sleep behavior, etc. Resetting them does not risk the loss of any data or other adverse effect.
So just go ahead and fire these action without any worry. Both of these components are important for your Mac to run it properly, but once they get corrupted, things gets cranky. As mentioned earlier resetting NVRAM affect the settings for startup disk so post resetting the NVRAM , you may need to select the correct working startup disk specially if you have more than one operating system or hard disk installed on a Mac.
You will see an option to select the desired operating system or startup disk from the list.https://pulchvavili.tk
How To Fix A Mac Stuck On Apple Logo At Startup
Disk utility can turn out to be the most useful tool when a Mac is in no boot situation or it boots to a grey screen and stuck on Apple logo with a loading bar. Here are the Major task that we perform when in disk utility in context of grey screen startup problem. Repair Startup Disk 2. Repair Disk Permissions. Check the Free Space on Startup Disk 4.
How to Fix Grey Screen at Startup on Mac
Once the Mac has booted from recovery partition, you may be asked to select the language, choose English US and click arrow key at the bottom to continue. Now select disk utility from the four macOS utilities options and hit continue again. You will see exactly the same Disk utility as it appears in macOS environment when boots normally.
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One of the most important checks you should perform here is verify the SMART status of the startup disk. If it shows anything other than Verified, then it is most likely the problem with startup disk and you should immediately take the backup of your disk and replace it. Disk utility will now verify disk for any error, corruption in file system, permissions error, corrupt directory entries and other problems related to files and directories, etc.
Remember that, older Mac OS X v When we are already in disk utility, why not we check the free disk space on startup disk, also, as this could be another reason to grey screen startup problem. When you select the startup disk on the left pane in disk utility, you would be able to see the available free space on the bottom right hand side. Make sure you have enough space available for macOS to boot and work properly. You should have at least 10GB of free space. If you have enough space then skip and move on to the next step. If the Mac were able to start in safe mode, it would have been easier to free up disk space on startup disk as you could have simply gone to different folders, checked the unwanted file and deleted them and finally emptied the trash to claim more space.
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So, follow the steps mentioned below to free up some disk space. Go to Utilities menu up at the top and select terminal. Double check every command for typo before executing it as it could be dangerous and lead to data lose. Also its a good practice to use ls command every time to list all files and directories of a folder to be sure that you are in the right working directory and it contains the item you want to delete.