Check "Verify startup disk".
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You may try rebooting your MacBook in a special mode, called "special power cycle" which involves the following steps. The problem appears to be somehow concerned with the battery power circuit with Mac failing to light up the screen. There is a fairly simple solution to it, though, quite an odd one — involving a flashlight or a lamp. Shine the flashlight through the Apple logo on the back of your screen.
How to bypass the power button on a 2012 MacBook Pro
The screen should light up normally right after that. Try this in a dark room for greater effect. System Management Controller is responsible for many ground-level functions of your Mac. Among those are battery settings, display reactions, and specifically the Power button functions. Putting hardware-related issues aside, there would be still many explanations for your Mac's misbehavior.
But to give you a perspective, here are a few more ideas to check:.
Ensure It Has Power
Luckily, all these problems can be fixed using just software solutions. To get a health check for your Mac, start with a simple maintenance tool for Mac — a program of CleanMyMac type will do.
Press this combination to quit all apps and restart the Mac. Press these buttons to quickly turn off your Mac. Press this key combination to log out of the current user account.
Log out will happen after confirmation. When you add Option key to the mix, you will not be asked to confirm and log out will occur right away. Press this key combination to quickly turn off the screen, and put Mac to sleep. Apple markets the Apple Watch as their most personal device ever, with lots of customization options Download it for free here.
How to force reboot a frozen Mac
Hope this guide has helped you. Before you force shut down this article, feel free to share it, using the social buttons below. Ivan Exploring latest tech trends.
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Apple obsessed. CleanMyMac X.
How to Shutdown, Restart, Sleep or Log Out on Mac with Keyboard shortcuts only - iOS Hacker