imac 27 late 2013 black screen on startup random

Now Turn on your computer by pressing the power key while holding down the Shift key Re-building this Launch Database often resolves your Mac getting stuck on the white screen. A Safe Boot rebuilds your mac’s Launch Database on your hard drive! Try a Safe BootĪll macOS and Mac OS X 10.2 and later have a Safe Boot feature that includes disk checking and repair.

Ideally, shut down between each addition. You might need to shut down your Mac, add one item, and start up again. Strictly follow a process of elimination. If it boots up now, one of those disconnected peripherals (or a combination of them) is the source problem.Īdd each peripheral back one at a time to determine which one(s) are the problem. If at all possible, use the Apple-branded keyboard and mouse that shipped with your Mac. If you installed any expansion cards, remove those too. So before you get drastic and try safe mode or other measures, shut down your Mac and disconnect all wired and wireless (Bluetooth) peripherals except your keyboard, mouse, and anything else necessary to reboot. Often it’s those third-party peripherals that get our Macs into trouble. Mac OS X: How to install, update & uninstall appsįix Your Mac’s White (or Gray) Screen 1. Before You Do Anything Else, Check Your Peripherals!.Factory Reset MacBooks and Macs on macOS.MacBook Stuck on Apple Logo and Won’t Boot? Here’s a Fix.MacBook or Mac Not Starting Up After macOS Update? How-To Fix.Run Apple Diagnostics or Apple Hardware Test.Launch Single User or Verbose Mode with Terminal.Power up your Mac with the Startup Manager and select your Startup Disk Manually.Quick Tips Try These Steps to troubleshoot and fix a Mac Stuck on White Screen No Time? Check out our Step-by-Step Video Tutorial.Run Apple Diagnostics or Apple Hardware Test! How-To Create a Disk Image From Disk Utility.Go Beyond Verbose Mode With Single User Mode.See Additional Details with Verbose Mode.Using Terminal in Single User Mode or Verbose Mode How to reset NVRAM on late-2016 MacBook Pro models.If Internet Recovery isn’t an option, try bringing up Startup Manager.Don’t Know if your Mac has a Recovery Partition?.A Safe Boot rebuilds your mac’s Launch Database on your hard drive!.Fix Your Mac’s White (or Gray) Screen 1. Before You Do Anything Else, Check Your Peripherals!.

Imac 27 late 2013 black screen on startup random