imac 27 late 2013 black screen on startup random

Hold these buttons while powering on to perform a PRAM reset. Release the keys when you hear a second startup chime, see a second startup logo, or after 20 seconds.Press the power button and then hold the keys listed above.Locate the following keys on your keyboard: command+shift+P+R.Shut down your machine by going to Apple > Shut Down.Resetting the PRAM can be a quick and easy way to resolve multiple potential problems with your Mac, including unexpected shutdowns.Īfter resetting the PRAM, you may want to go through your System Preferences to manually restore some of your settings. The Parameter RAM - or PRAM - stores various small preferences for your Mac such as the volume, screen brightness, or startup disk. Shut Down your computer from the Apple Menu.Restart your computer from the Apple Menu.Put your computer to sleep from the Apple menu.Press cmd+alt+esc and Force Quit any applications that are Not Responding.Correctly powering off your Mac, from the Apple menu, allows all the process and programs running in the background to close safely, reducing the risk of further issues.Īfter an unexpected shutdown, power up your Mac again and try each of the steps below: But an unexpected shutdown is not the same as a proper one. Of course, you’re only reading this if your Mac has already powered itself off. Mac or MacBook doesn’t recognize external drives, troubleshooting tips.How to fix a Mac that will not shut down.MacBook will not start up after macOS update.This support article from Apple is primarily targeted at the 13 inch 2019 MacBook Pro models. Check for corrupt user accounts and Pref files on your MacBookĪpple has acknowledged the issue and updated its support article with a list of steps that you need to take and reach out to Apple support if your MacBook is experiencing random shutdowns.Using Verbose Mode to quarantine corrupt Files.Run a report for your System configuration.macOS High Sierra and later, Try Single User Mode.

Launch MacBook in Safe Mode to perform Auto-Repair.Remove any MacBook accessories and Power Reset.

How to fix the MacBook restarting problem.

MacBook without a T2 Security Chip (Removable Battery):.

MacBook without a T2 Security Chip (Non-Removable Battery):.

iMac or MacBook with a T2 Security Chip:.

Imac 27 late 2013 black screen on startup random