Kappy Kappy. Desktops Speciality level out of ten: A Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later You should try each, one at a time , then test to see if the problem is fixed before going on to the next.
Be sure to backup your files before proceeding if possible. Shutdown the computer, wait 30 seconds, restart the computer.
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Disconnect all third-party peripherals. Start the computer in Safe Mode.
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Test in safe mode to see if the problem persists, then restart normally. Use Apple Hardware Test to see if there is any hardware malfunction. Repair the disk by booting from the Recovery HD.
Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented usually, Macintosh HD volume entry from the side list.
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Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
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Repair permissions on the Home folder: Resolve issues caused by changing the permissions of items in your home folder. Click on the lock icon and enter your Admin password when prompted. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another. Immediately after the chime hold down the Command and R keys until the Apple logo appears.
When the Utility Menu appears: When Disk Utility loads select the drive out-dented entry from the Device list. Click on the Erase icon in Disk Utility's toolbar.
A Solution for MacBook Pro Booting to a Black Screen
For the past few months the screen would randomly shut off every once in a while, almost as if it was put to sleep. Usually a few clicks on the mouse or a couple of taps on the power button would wake up the monitor. Then, about a week ago it became much worse. When starting up, the display will work for about 4 or 5 minutes before going black.
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Waking it from a long sleep will also see it work for a minute or two at most. Thinking it may be a heat issue I cranked the fans using iStat menus with no change. I did open up the iMac in the past, once about 3.
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I am inclined to suspect a hardware issues here, this does not necessarily mean component failure but rather internal cabling coming loose due to thermal activity. You mentioned that it has gotten worse, working only a few minutes before it goes dark and then waking it from a long sleep makes it work again for a short while.