Repair Your Hard Disk in Single User Mode. Mac OS X has a built- in disk diagnostic and repair program called fsck or file system consistency check. Unlike Disk Utility, which can only verify the current startup disk, fsck will verify and repair the current startup disk.

Here’s how to verify and repair your startup disk with fsck. Ati Radeon Xpress 1300 Driver there. Start or restart your Mac. As soon as you hear the startup tone, press and hold Command- S on the keyboard. Keep holding down those keys until you see a black screen with white lettering. This is called “booting into Single User Mode.” As soon as you see the black screen with white lettering, you can release the keys. The single user mode screen.

As the Mac boots in this mode, the screen reports each step of the process. Wait until the scrolling white text stops. The last line should end in root#. Right after the root# prompt, enter the following: /sbin/fsck - fy. Press the Return key.

Now reboot your Mac. If it boots up now, one of those disconnected peripherals (or a combination of them) is the source problem. Add each peripheral back one at a. Don’t worry, it happens and you aren’t out of luck. You’ll need to reset the forgotten password and there.

You’ll see the prompts in the picture above as each part of the hard drive’s directory is checked. At the end, if your drive was OK, the screen will say “The volume (name of your hard drive) appears to be OK”. If any repair was made, you’ll see the prompt, “FILE SYSTEM WAS MODIFIED”. Then, you’ll see the root# prompt again.

Right after the root# prompt, enter the following: reboot. Press the Return key. Your Mac should restart normally.

My Mac won't start: How to fix white screen. Recently I had this problem.

Repair Your Hard Disk in Single User Mode. Mac OS X has a built-in disk diagnostic and repair program called fsck or file system consistency check. 49 thoughts on “ How to fix (fsck) a root file system that you have to boot into on Linux ”.

My Mac would turn on, but it would get stuck on the white screen upon startup after a chime. This white (or gray) screen means that your mac. OS or OS X can’t start because of problems with the system’s hardware or software. If your Mac fails to start- up regularly, try these few things to troubleshoot your problem(s).

Related Articles. Check out our Step- by- Step Video Tutorial. Or, if preferred, follow along with the detailed instructions below. Fast Track Disconnect all peripherals. Restart in Safe Mode.

Run Disk Utility. Reset NVRAM (or PRAM)Launch Single User Mode with Terminal. Reinstall mac. OS or OS XBefore You Do Anything Else, Check Your Peripherals! Often it’s those third- party peripherals that get our Macs into trouble. So before you get drastic and try safe mode or other measures, shut down your Mac and disconnect all wired and wireless (Bluetooth) peripherals except your keyboard, mouse, and anything else necessary to reboot. If at all possible, use the Apple branded keyboard and mouse that shipped with your Mac. Now reboot your Mac.

If it boots up now, one of those disconnected peripherals (or a combination of them) is the source problem. Add each peripheral back one at a time to determine which one(s) are the problem. Try a Safe Boot. All Mac. OS and Mac OS X 1. Safe Boot feature that includes disk checking and repair.

A Safe Boot rebuilds your mac’s Launch Database on your hard drive. Re- building this Launch Database often resolves your Mac getting stuck on the white screen. First, start your Mac in Safe Mode. To do this, shut down your Mac.

Now Turn on your computer by pressing the power key while holding down the Shift key. When you see the Apple logo, release the Shift key. After your Mac fully starts, restart your computer normally without holding any keys/buttons during startup. Note that Safe Boot is slower to boot. One you boot and log in using Safe Mode, the very first thing is emptying your Trash!

After dumping the trash, open a Finder info window on your hard drive (default name is Macintosh HD unless you gave it a different name. Verify that this hard drive has AT LEAST 1. GB of available space. If your Mac doesn’t have 1.

GB free, move some of your largest files to another drive (either internal or external–JUST NOT another folder on your Macintosh HD. Once you move those files off your hard drive to another location, delete them from your Macintosh HD and empty the trash. Repeat as often as necessary until you have the minimum 1. GB of available space on your Macintosh HD. Once you reach that 1.

GB, restart as normal. Run Disk Utility.

Turn your Mac off by holding down the power button for a few seconds. Turn on your Mac and hold down the Command and R keys until you see the Apple logo. Then you should see a Mac OS X Utilities or Mac. OS Utility window. Select Disk Utility, click your Mac.

OS or OS X hard drive and select verify/repair disk. If Disk Utility reports that the volume isn’t repairable, the drive needs replacement. Alternatively, if this is the very first time an error has occurred on that drive, you might choose to erase the volume and restore from a backup. Proceed with caution!

Once a drive fails, it’s likely to fail again. Recovery Partition Not Showing Up?

If your Mac fails to boot up into Recovery, there are still a few options. You must have an internet connection to try this option.

If Internet Recovery isn’t an option, try bringing up Startup Manager. Once Startup Manager appears, choose how your Mac boots from the on- screen options, including any connected bootable hard drives, Recovery partitions, USB flash drives, network locations, and other boot devices. Verify & Repair Permissions. If your OS still allows you to run Verify and Repair Permissions, perform that step as well. Apple claims that all system file permissions are now automatically protected and updated during software updating. However, for El Capitan, you CAN access Repair Permissions using Terminal (not so in mac. OS.)  This article features the detailed steps on how to fix permissions in El Capital.

Reset PRAM or NVRAMResetting PRAM or NVRAM might just fix your boot failure. PRAM (parameter random- access memory) or NVRAM (non- volatile random- access memory) is a small amount of your computer’s memory that stores certain settings in a location that mac. OS can access. This includes settings like your mac’s speaker volume, screen resolution, startup disk selection, and any recent kernel panic information. If you experience issues related to these features, resetting PRAM or NVRAM might help. How to reset NVRAMShut down your Mac. Find Command (. Take your Mac to an Apple Store or Apple Authorized Service Provider to replace the battery on its logic board. Using Terminal in Single User mode.

Most times, the steps above will usually fix your problem. However, if it did not work for you, there are a few additional steps that you can take before you decide to Reinstall mac. OS or Mac OS X on your machine. In this step, you run in Single User Mode using the command fsck, which stands for a file system check.

This is normal. When this stops, run the commands listed below to check the health of your Mac’s startup disk. Restart your Mac. When you hear the startup tone, press and hold Command- S.

Keep holding down these keys until you see a black screen with white letters. This action boots into your mac’s Single User Mode. The first three steps help you launch into the single user mode on your Mac. Step – A. Immediately Hold down Command- S for single- user mode. Now you have launched your Mac on a Single user mode. The next few steps will help check for file system consistency and remount the boot volume. Step – D. On the terminal window Type fsck –fy and press return.

Step – E. You’re booting up in mac’s Single User Mode. Now let’s try another command in Terminal. In the Terminal windows, type this command: /sbin/fsck - fy and then press return. A system of checks runs.

When completed you see one of two messages. Macintosh HD appears to be okay” OR “File System was modified.”If you see the system OK message, enter the command reboot and press return. Perform a Safe Boot (follow step 1)If you received the modified message, execute the command: /sbin/fsck - fy again. Repeat this file system check until you get the system OK message.

Once you get the OK message, enter the command reboot and press return. Perform a Safe Boot (follow step 1)Terminal Commands Explained. Dot Hack Legend Twilight Wiki Movie here. For those interested, here’s the breakdown of what these Terminal commands dofsck –fy. Checks the boot volume’s file system and repairs if needed. The - y means yes, go ahead and fix any problemsmount –uw. Remount the boot volume, enabling write accesstouch /private/var/db/.

Apple. Setup. Done. Tells the computer it has completed the setupexit. Continue the boot processreboot/sbincontains executable programs needed to boot the system by the root user. These Seven steps above should help your Mac deal with the White Screen issue.

If you are dealing with white screen after installing El Capitan, check out our article that specifically addresses the El Capitan issue. Reinstall Mac. OS or Mac OS XIf nothing above works, you may try this. Connect your Mac to the Internet. Turn your Mac off by holding down the power button for a few seconds. Turn on your Mac and hold down the Command and R keys until you see the Apple logo. Then you should see a Mac OS X Utilities or mac. OS Utilities window, and this time select the Reinstall option.

Mac. OS Internet Recovery. There’s also an option to reinstall Mac. OS from the Internet rather than your recovery partition. Release the keys when you see the Apple logo. Internet startup completes when you see the Utilities window.

Choose Reinstall Mac. OS (or OS X) from the utility window and follow the onscreen instructions. Reader Tips A reader of Apple. Tool. Box unplugged the power cord from the Mac. Book and turned on the blank screen and let just the battery run down completely.