Blog » What to do if a blank blue screen appears at the startup in Mac?
What to do if a blank blue screen appears at the startup in Mac?

What to do if a blank blue screen appears at the startup in Mac?

While starting Mac, if you see a blue screen with a spinning wheel then you should understand there is some problem exist with startup item or software.Under such circumstances first, start your Mac in safe mode. To start Mac in safe mode, press Shift key immediately after you hear startup sound. When Apple logo appears on the screen, just release the keys. Now safe boot will appear on your Mac OS X startup screen.

If your Mac does not start in safe mode then you have to repair startup disk using Disk Utility.Also, check out alternative methods that are described below to troubleshoot your Mac –

Repair Startup disk using Disk Utility –

  1. To open Disk Utility, go to Applications and then tap on Utilities.
  2. Once you entered into Disk Utility, you have to choose the volume from the left pane that you want to run FirstAid on. It does not matter if it is an external hard drive.Then tap on FirstAid.
  3. After this, to start the verification and repair process, just tap on Run.
  4. Once Disk Utility completes the repairing process, you will see drop-down displaying the status.
  5. If everything is OK or no errors are detected then you will see a green checkmark at the top of the drop-down list.
  6. On the other hand, if errors are detected then Disk Utility will repair them automatically.

If due to any reason Disk Utility is unable to repair disk then you should upgrade your Mac before it gets too late.

Boot your Mac OS X from another Startup device –

  1. Start your Mac and press Option button. By doing this, a list of available startup device will display on the screen. Choose a device from that list to boot your Mac.
  2. Once desktop appears on Mac, be ready to repair the permission issue. Now, launch Terminal by navigating to Applications > Utilities folder.
  3. Now, you have to enter this command in Terminal. sudo chown root “/Volumes/startupdrive/”(Just replace the startup drive from the name of startup drive that is having problem.)
  4. After entering this command, press Enter key. Now, you will be asked to enter the administrator password, just enter it accurately and hit Enter.
  5. Enter the following command and press Enter key at once. sudo chmod 1775 “Volumes/startupdrive/” (Replace the startup drive with your startup drive.)

Now your startup drive has correct permissions and able to boot your Mac OS X.

What to do if you don’t have another startup device?

There is no need to get worried if you don’t have another startup-device, just use the special single-user startup mode to modify the startup drive’s permissions.

Let’s see the process –

  1. Start your Mac while pressing Command + S keys simultaneously. Hold these buttons until you see scrolling text on the screen.
  2. Once the text stopped to scroll, Command Prompt will appear on the screen. At the Command Prompt, type “mount – uw /” and hit Enter key.
  3. Next, type “chown/ root/” at Command Prompt ‘s screen and again press Enter.
  4. After this, type “chmod 1775/” and press Return.
  5. In last, type “Exit” and hit Enter. Now your Mac OS X will boot from startup-drive.

Hope, after applying these techniques your Mac will run like normal again. So, what are you waiting for, just go for these simple troubleshooting measures for your Mac and don’t forget to share your views in the comments section.

Leave a Reply

Your email address will not be published. Required fields are marked *