If you cannot mount your drive in Target Disk mode, or find it is slow to access, then this indicates a problem with your drive and you might need to have your Mac serviced. If you cannot get your Mac to load in Recovery Mode, then it is time to test its hardware for any detectable errors. To boot to the Internet-based hardware tests, do the same but hold Option-D instead.
If an error occurs, you will see a reference to it output on the screen; however, if not then it will indicate no errors are found. If any of the above tests fail to work, then you likely have a hardware problem that cannot be overcome on your own, and it is time to schedule a repair for your Mac. However, if you can access these modes without error, then you can perform any of the following approaches for fixing your system:.
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If Safe Mode works, uninstall recently added software or undo other recent changes that may have contributed to the problem. This can be done using official uninstallers that are distributed with programs, or by contacting developers for uninstall instructions. You can also access reputable troubleshooting resources to determine what exactly might be done for specific software errors. Granted you can restore from a recent backup, but not knowing the reason for the hangup at boot means any number of recent backups may contain the faulty configurations that are causing the problem.
On the other hand, reinstalling OS X should not overwrite your personal files at all, and only replace system software files.
Provided your hard drive is in working order, this should get it to boot again. Wipe and reinstall OS X if a basic reinstall does not work. To do this, first ensure you have a full backup of your system, and then use Disk Utility in Recovery mode to erase your hard drive. You might consider re-partitioning and formatting your drive, but at least erase it in full.
Then return to the tools menu and again reinstall OS X from scratch. When done, you can use the OS X Setup Assistant to migrate your data and applications from your backups. This approach will ensure OS X is fully operational, and will copy files from your backups to your Mac in a way that is supported and should ensure the system remains functional. I believe you missed an important step, the use of cloning software. I clone this disk once a day. In a case were the Mac boots to a grey screen I am able to boot to the external drive which has a cloned copy of my hard drive.
This lets me know if there is a hardware problem if the external drive will not boot my Mac. If the problem is software-based, then a clone may also have inherited the problem and similarly not work. However, having a clone is definitely always a good idea. That was the problem in my case.
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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.
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.
Mac White Screen: How To Fix Your Mac That Won’t Turn On
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.
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.
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Repair Startup Disk 2. Repair Disk Permissions. Check the Free Space on Startup Disk 4. 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.
Tackle your Mac booting to a gray screen
You will see exactly the same Disk utility as it appears in macOS environment when boots normally. 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. 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. If you have more than one user account and you do not need anything stored by the other account you can simply delete the home folder belonging to the unwanted account. It can free up gigabytes of space. Type the following commands to delete all the contents of that user. Type the following command.
You can also clear the downloads folder if not required as it mostly contains the stuff that you can download again. To clear the downloads folder — come out of the library folder first by typing the following command cd.. Similarly you can go to Movies and iTunes folder under library to delete some videos and iTunes backup files to quickly recover gigabytes of space. Now to go to Applications folder and list all the applications you have installed.
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