Cannot open disk utility on mac

When a Mac fails to start up normally, one of the common troubleshooting practices is to verify and repair the startup drive. A startup drive that is experiencing problems is likely to prevent your Mac from starting, so you may find yourself in a catch The easiest solution by far is to boot from a different device. To boot from another hard drive or a USB flash device, hold down the option key and start up your Mac.

The Mac OS startup manager will appear, allowing you to select the device to boot from.

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To start up in Safe Mode , hold down the shift key and then start your Mac. It will also delete some of the startup caches that may also be preventing your Mac from starting successfully. When First Aid is finished, restart your Mac normally.

You should use this startup mode only for troubleshooting and not for running day-to-day applications. For the two Caches folders above, macOS will ask for permission by requiring you to enter your user password. Once the contents of all three Caches folders have been dragged to the Trash, restart your Mac and only then empty the trash. System Preferences — Create a new user account. About The Author. Michael Kummer I was born and raised in Austria.

I speak German, English, and Spanish. Since moving to the U. In my twenties, I was a professional m sprinter. These days I do mostly CrossFit.

I'm a technologist and Apple fan. I love science and don't believe anything unless there is proof. I follow a Ketogenic Paleo diet and intermittently fast every day.

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I'm married and have two trilingual kids. My goal with this blog is to share what I learn so that you can spend time on something else. Check out my latest Diet , Fitness , and Technology articles. Michael W. Perry says:.

How To Repair Disk With Mac Disk Utility

Apr 27, at am. Raymond Tan says:. Apr 30, at pm. Michael Kummer says:. May 1, at am. Derek Dewitt says:. Apr 18, at am. Alex says:. Jun 20, at am. James watson says:. Jun 25, at pm. Close dialog. Session expired Please log in again. I don't know what to do. No Hard disk is shown to select.

How To Repair Disk With Mac Disk Utility

Can you boot to internet recovery? Plug in a USB drive. Does Disk Utility find it? U You are god! I did not have to use sudo in recovery though! I am basing my reasoning off this statement: My OS is corrupted, that is the reason why I want to do a fresh installation. To verify that this is the case, there are a couple steps to take Boot like you described,then run the command: diskutil list You will get a listing of your drives.

Replace the Drive.. El-capitan crashing while booting How do I know if I need a new hard drive? Allan Allan I tried all of the above. I checked the smart status and it returned "Verified". I also ran the Apple Diagnostics my macbook is early-mid and still no issues found. Any other ideas? Then try to do install. Even if it doesn't work, you will want to have this USB handy.

1. Run Repair Disk Permissions

Then we'll go from there. HD is not shown, but you are able to get into Disk Utility?

How to fix MAC OSX Hard Drive formatting issue 2018

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