Because you can't start your Mac up successfully, you'll have to boot from another drive that has a system on it, or from a DVD install disk.
If you're using OS X Lion or later, you can boot from the recovery disk; if you're not sure how to do that, you'll find instructions in the guide at the link below. If you don't have a startup option other than your usual startup drive, you can still try to repair the drive by starting your Mac in single-user mode. This is a special startup environment that allows you to work with your Mac using commands that you type into a Terminal-like display.
Because single-user mode doesn't require the startup drive to be completely functional, we can use some of the commands to perform drive repairs.
What to do if a blank blue screen appears at the startup in Mac?
In most cases, repairing the drive will get your Mac working again, but be aware that a drive that has exhibited this type of problem is likely to do it again. Take this as an early warning that your startup drive is having issues, and consider replacing the drive soon. Be proactive and make sure you have backups or clones of your startup drive available. While repairing the startup drive should solve the blue screen problem for most users, there's another less common drive issue that can cause a Mac to freeze at the blue screen, and that's a startup drive that has its permissions set incorrectly.
It can also happen to those of us who like to experiment with Terminal commands, and accidentally change the startup drive's permissions to not allow any access. Yes, it is possible to set a drive to deny all access. And if you happen to do that to your startup drive, your Mac won't boot. We're going to show you two ways to fix a drive that was set to no access. The first method assumes you're able to start your Mac using another startup drive or an install DVD.
You can use the second method if you don't have access to another startup device.
- Step 1: Run Disk Utility.
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- What To Do If a Blank Blue Screen Appears At The Startup in Mac?.
Boot your Mac from another startup device. You can do this by starting your Mac and holding down the option key.
Drive permission issues are likely causing the problem
A list of available startup devices will display. Select a device and your Mac will use it to finish booting. Once your Mac displays the desktop, we're ready to correct the permissions problem. Enter the following command in Terminal. Note that there are quotes around the startup drive's path name. This is necessary to ensure that if the drive name contains any special characters, including a space, that it will work with the command. Be sure to replace startupdrive with the name of the startup drive that is having problems:. You will be asked to provide your administrator password.
Enter the information and press enter or return. If you don't have another startup device to use, you can still change the startup drive's permissions by using the special single-user startup mode. Continue to hold both keys down until you see a few lines of scrolling text on your display. It will look like an old-fashioned computer terminal.
A Solution for MacBook Pro Booting to a Black Screen
Hope, after applying these techniques your Mac will run like normal again. Your email address will not be published. Also, check out alternative methods that are described below to troubleshoot your Mac — Repair Startup disk using Disk Utility — To open Disk Utility, go to Applications and then tap on Utilities. 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.
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- Step 2: Safe Boot.
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After this, to start the verification and repair process, just tap on Run. Once Disk Utility completes the repairing process, you will see drop-down displaying the status. If everything is OK or no errors are detected then you will see a green checkmark at the top of the drop-down list.
On the other hand, if errors are detected then Disk Utility will repair them automatically. By doing this, a list of available startup device will display on the screen. Choose a device from that list to boot your Mac.
Troubleshooting case: Fixing a blue screen issue in OS X
Once desktop appears on Mac, be ready to repair the permission issue. Now, you have to enter this command in Terminal. After entering this command, press Enter key. Now, you will be asked to enter the administrator password, just enter it accurately and hit Enter.
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