A Solution for MacBook Pro Booting to a Black Screen. Rarely, a Mac may encounter some peculiar issue during system boot that can cause quite a bit of panic, like booting to a completely black screen.
It would be easy to interpret that as a potential hardware problem, and in some particularly rare situations that may be the case, but it’s more often a software issue that can be resolved with some simple troubleshooting steps. Case in point; one of our readers experience with his MacBook Pro, which out of the blue rebooted to a completely dark screen. Though it’s rare, we figured this would be a good opportunity to share three potential solutions to this problem, and similar issues, should you encounter a dark screen on system start. First, Reset the System Management Controller to Fix the Black Display on Boot.
How to use Mac Recovery System to restore Mavericks. If your Mac won't start up, don't panic.
The built-in Recovery System can get you up and running! A flashing question mark or flashing globe on boot is one of the scariest sights imaginable to a Mac user. It means that the Mac is not finding the system software it needs to continue booting. You're not doing anything else on this Mac until this is fixed. Since OS X 10.7 Lion, Apple has included the ability for Macs to restart using a special system called the Recovery System. Don't do this unless you're prepared to, at least for a short time, risk losing all the data on your hard drive.
The first step is to establish that your Mac's hard drive (or in the case of many newer Macs, flash drive) is in good working order. OS X: What is Safe Boot, Safe Mode? - Apple Support. Learn more about Safe Mode, a special way to start up your Mac.
What is "Safe Mode"? Safe Mode (sometimes called Safe Boot) is a way to start up your Mac so that it performs certain checks, and prevents some software from automatically loading or opening. Starting up in Safe Mode does several things: It verifies your startup disk, and attempts to repair directory issues if needed.Only required kernel extensions are loaded.All user installed fonts are disabled while you are in Safe Mode.Startup Items and Login Items are not opened during startup and login on OS X v10.4 or later.In OS X 10.4 and later, font caches that are stored in /Library/Caches/com.apple.ATS/uid/ are moved to the Trash (where uid is a user ID number).In OS X v10.3.9 or earlier, Safe Mode opens only Apple-installed startup items.
These items are usually located in /Library/StartupItems. Together, these changes can help resolve or isolate certain issues on your startup disk. How to Reset NVRAM on your Mac - Apple Support. Learn about your computer's NVRAM, and when and how to reset it.
What is NVRAM? A small amount of your computer’s memory, called “non-volatile random-access memory” or NVRAM, stores certain settings in a location that OS X can access quickly. The settings that are stored in NVRAM depend on the type of Mac you're using, and the types of devices connected to it. Information stored in NVRAM can include: Speaker volumeScreen resolutionStartup disk selectionRecent kernel panic information, if any If you experience issues related to these features, you might need to reset the NVRAM on your computer. Resetting NVRAM Shut down your Mac.Locate the following keys on the keyboard: Command (⌘), Option, P, and R. After resetting NVRAM, you may need to reconfigure settings for speaker volume, screen resolution, startup disk selection, and time zone information. Learn more. Mavericks won't start after reboot, just gettin...
Take each of these steps that you haven't already tried.
Stop when the problem is resolved. Step 1 The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. Black login screen on your Mac? Here's the fix! You restarted your Mac, and now you can't log in.
The Apple boot screen appears and pinwheels for a few moments, then the screen goes black. You can still see a cursor, but you can't log in and get any further. Don't panic! We have the fix! When and How to Reset Mac SMC (System Management Controller) “Ahhhh my Mac isn’t working!
I need to reset the SMC!” You have tried rebooting, you’ve reset the PRAM, you’ve done it all, but your Mac is still behaving strangely. What next? In certain circumstances, resetting your Mac System Management Controller (SMC) can be a solution. This is sometimes necessary to restore normal lower level system functionality to your Mac, particularly for power and hardware related troubles.
We’ll show you exactly how to reset the SMC on any type of Mac (and any version of OS X) and the type of problems that it may resolve. When & Why Reset SMC on a Mac? Typically, an SMC reset helps to resolve many power and hardware related issues that are otherwise unresponsive to troubleshooting techniques.
. * Issues with your Mac cooling fans and fan management: the fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc Here’s the key sequence to hold down: How to Reset PRAM on a Mac. Resetting your PRAM is a common troubleshooting technique when a Mac is misbehaving.
I’ll cover how to reset PRAM in addition to information about PRAM to help you understand when and why you’d want to reset it. Resetting the PRAM You reset the PRAM by rebooting a Mac and then immediately hold down the Command+Option+P+R keys, you will then hear the Mac reboot sound again, signifying your PRAM has been reset. You must hit the key combination before the grey screen appears otherwise it won’t work. How do you know the PRAM is reset? The PRAM has been reset only if you hear the Mac reboot sound a total of two times – once for the initial reboot and again when the PRAM has been reset (technically you can keep holding down the key combo and reboot the Mac over and over, but there is no practical reason to do so).