Power Lines Down Mac OS

Power Lines Down Mac Os 11

Mac or MacBook stuck when shutting down or restarting? How to fix?

These two memory areas store settings and information that is not cleared whenever you turn off your Mac’s power. To do this, you’ll want to turn off your Mac, and then turn it back on while. Shut down the computer. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. Release all the keys and the power button at the same time. To simply shut down your Mac safely and securely — letting all the background voodoo happen automatically — hit Control-Option-Command-Power (or Control-Option-Command-Eject). Global Nav Open Menu Global Nav Close Menu; Apple; Shopping Bag +.

You might finish work on your Mac, attempt to shut it down, only to find that it is stuck on a desktop picture without any icons. Or perhaps the MacBook freezes on a black screen, but you can still hear sounds from the device (HDD, etc.) Furthermore, you might attempt to unplug the power adapter and remove the battery, but still notice that the computer has not completely shut down. If you encounter these issues when attempting to restart or shut down a Mac computer, this article may be useful.

Unfortunately, many people encounter these problems, which commonly arise following an operating system update. Windows users who have recently switched to a Mac computer will probably not be too surprised, since this is a common issue on Windows platforms. Fortunately, Macs have built-in tools to solve these problems. The first step when troubleshooting these issues is to force the Mac to shut down and reset System Management Controller (SMC) and Non-Volatile Random-Access Memory (NVRAM). Follow this guide to resolve Mac restart and shut down issues.

Table of Contents:

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What is SMC and what is its function?

System Management Controller (SMC) is a low-level Mac hardware component that controls computer power consumption, battery charging and functionality, thermal and fan activity, GPU and video mode functionality/video output, sleep/wake modes and led lightning management, and other hardware functionality. Resetting the SMC might solve issues related to these devices.

Reset SMC of a MacBook Air, MacBook Pro Retina, or MacBook Pro with an integrated battery

First, shut down the device and connect the power adapter to the Mac.
Hold down the Shift, Control and Option keys while clicking the power button.
Finally, release all keys simultaneously - the light on the MagSafe adapter might change color to signify that SMC has been reset.
After a successful reset, reboot the computer in the usual way.

To reset SMC on a non-portable device, follow these instructions:

Shut down the Mac.
Disconnect the power cord.
Hold down the Mac power button for five seconds.
Release the button, reattach the power cable, and boot the Mac in the usual way.

For more information and detailed instructions read this guide.

Reset NVRAM

NVRAM (non-volatile random-access memory) is small area of Mac memory that stores certain settings in a location accessible by the macOS. The memory area stores information such as speaker volume, screen resolution, startup disk selection, and any recent kernel panic reports. To reset the NVRAM, shutdown the Mac. Turn it on, and after the loading chime, hold down the Option, Command, P and R buttons together. Keep holding this combination for at least 20 seconds. The display should appear as if the computer is restarting. If you hear the start up chime again, release the buttons.

What is a kernel panic?

Sometimes shutdown problems are caused by recent 'kernel panic' events - resetting the NVRAM should solve these issues. Kernel panics often result in various system crashes involving restarts and shutdowns. A kernel panic is essentially a system error when the Mac operating system is unable to quickly or easily recover. These errors are commonly the result of actions when the Mac attempts to write or access memory incorrectly. They are often caused by corrupted software, software bugs, or malware. Sometimes, they are caused by damaged or incompatible hardware, including faulty external devices connected to the Mac.

Launch Apple Diagnostics or Apple Hardware Test

Apple Diagnostics and Apple Hardware Test are built-in tools that can help to diagnose problems related to the Mac's internal hardware, including parts such as system memory, logic board, and wireless components. Furthermore, these tools are accessible even if the MacBook (or other Apple computer) is unable to boot properly. Follow the steps below to run the diagnostic tool.

Before you start troubleshooting, bear in mind that none of these tools are able to inspect external components, such as external storage or devices, not manufactured by Apple. Also, these particular tools examine hardware only and do not check operating system status.

For Macs released after 2013, owners should look for Apple Diagnostics, which is included in their computers.
For computers released in 2012 or earlier and running OX X version 10.8.4 or later, use Apple Hardware Test, which is also included with the system.
If you have a Mac that was released in 2012 or earlier and running OS X version 10.8.3 or earlier, use the system software disc or USB flash drive that came with the Mac.

How to run Apple Diagnostics

Disconnect all external devices except the keyboard, mouse or trackpad and display. When all unnecessary components are disconnected, restart the Mac, and then press and hold down the D key while the computer restarts. Apple Diagnostics launches automatically - follow the on-screen instructions to proceed and a list with the problem detected will be displayed.

How to run Apple Hardware Test

Unplug all external components except the keyboard, mouse or trackpad and display. When all external devices are disconnected, restart the Mac, press and hold down the D key while the computers restarts. When Apple Hardware Test launches, a window with a list of languages will appear. Choose your preferred language and press Return or click the right arrow. If Apple Hardware Test did not launched, try to run it from the Internet. Reconnect the Apple computer to the network through Wireless or Ethernet and then restart. After the start up chime plays, hold down the Option and D keys. When Apple Hardware Test prompts, select your preferred language and follow the on-screen instructions. If the tool detects problems, they will be displayed on screen. Take a note of these details for contacting Apple Support or a certified service provider.

Try booting in a Safe Mode

A Safe Boot deletes system caches, rebuilds the Mac boot database on the hard drive - this frequently solves various issues. Furthermore, Safe Mode is probably the best way to check if the issue is global or limited to a particular user folder. Shut down and restart issues might be related to third-party software that is loading automatically. Safe Mode checks the system for errors and attempts to solve detected errors.

To enter Safe Mode, first shut down the Mac using whichever method works in your situation. When the computer has completely shut down, wait for approximately 10 seconds and press the power button again. When you hear the start up chime, immediately press and hold the Shift key, and release it when you see the Apple logo and progress indicator.

Bear in mind that safe boot takes much longer than usual, since the computer loads and also performs a system check. If the Mac works correctly, click the Apple logo and select restart.

Use terminal to clear your Mac

Experienced users often use Terminal to solve various issues - in this case, it also contains various options to try. First, open Terminal by using spotlight - hold command and press the spacebar, and type Terminal. Alternatively, go to the utilities folder through finder. Once Terminal has launched, type the following commands one-by-one and press Return after each command.

rm -rf ~/Library/Caches/*
rm -rf ~/Library/Saved Application State/*
sudo rm -rf /Library/Caches/*
sudo rm -rf /System/Library/Caches/*
atsutil databases -removeUser
sudo atsutil databases -remove
sudo atsutil server -shutdown
sudo atsutil server -ping
sudo rm -rf /var/folders/*

When you have tried all commands, restart the Mac.

Alternative methods to solve your shut down and restarting issues:

We recommend Combo Cleaner to clean Mac cache files and malware.
Remove all printers by going to System Preferences and selecting Printers & Scanners, and then add the required devices again.
Before shut down or restart, force quit any running apps by pressing Command, Option and Esc together.
Relaunch Finder before shut down from the force quit menu.
Ensure, the Trash is empty.
Try to shut down the mac via Terminal, type sudo shutdown -r now and press Return.
Enter Recovery Mode by holding Command and R while booting, go to disk Utility and run Repair disk, or First Aid to the hard drive.

Video Showing how to solve issue Mac stuck while shutting down or restarting:

Summary: This post helps fix a circle with a line through it (or a slash crossed-out circle) that shows on Mac boot and restart your Mac as usual. You'll also learn about what the prohibitory symbol means on Mac.

The sign, a circle with a line through it, has shown up on your Mac at startup suddenly. It's definitely not the bearer of good news but indicates some severe problems when Mac won't turn on normally.

Take attention! All files on your Mac are in danger. To avoid permanent data loss, rescue it from your Mac first, and then try the solutions below to fix the prohibitory symbol on Mac.

1. Recover data from Mac stuck on a prohibitory symbol (To avoid forever loss)
2. Fix Mac/MacBook having the circle with a line through it issue
3. What does the circle with a line through it on startup indicate

Retrieve files from Mac which shows a circle with a line through it

This video provides a detailed guide to recover data from Mac that won't boot, go watching it now.

To get the data off an unbootable Mac caused by the prohibitory symbol issue, only data recovery software can help you.

iBoysoft Data Recovery for Mac is a reliable and secure data recovery software. With it, you can recover data from Mac that won't boot in a simple way.

To get data off from Mac showing up O with a line through it, follow these steps:

Press Option + Command + R keys when startup until seeing the spinning globe. (Keep your Mac connected to the Internet all the time).
When entering into macOS Recovery mode, select Utilities > Terminal.
Type the following command to launch iBoysoft Data Recovery for Mac.

Then, you can scan, preview, and recover the files including documents, videos, photos, audios, etc. from your internal disk.

Have any questions? Learn more details from How to run iBoysoft Data Recovery in macOS recovery mode. If you don't want to read the article, watch the video above instead.

Guide to Fix the Prohibitory Symbol on Mac

To help Mac boot past the O with line through it or 🚫, and to fix your MacBook Pro having a circle with slash on startup, you can follow these steps.

Step 1. Boot the Mac into macOS Recovery mode

If your Mac like MacBook stuck on the prohibitory symbol screen and can't boot up normally, you can try to boot Mac into macOS Recovery Mode. Either from the local recovery system on your startup disk or from internet recovery system is okay.

Here is how to do this:

1. Force your Mac to shut down by holding the power button for 5 seconds around.
2. Restart the Mac and instantly hold Command + R key combinations.
3. Release these keys when you see the Apple logo or loading bar. Then you'll see the macOS Utilities, which means your Mac is in macOS Recovery mode.

Note: If you can't boot into macOS Recovery mode by the guide above, you can replace the key combinations with Option + Command + R (or Shift+ Option + Command + R), and keep your Mac connecting to the Internet.

If you are using an Apple M1 Mac and see this circle with a line through it, the way to boot into M1 Mac Recovery Mode is different.

Step 2: Repair the startup disk with Disk Utility

You may also see the circle with a line through it on your Mac if the Macintosh HD is corrupted.

First Aid in Disk Utility can find and repair errors that lead to Mac's unexpected behaviors that prevent your Mac from turning on. So, when your Mac won't boot past the sign of crossed-out circle, simply check, verify, and repair the startup disk with First Aid in macOS Recovery mode.

If First Aid succeeds in repairing the errors in the startup disk, you can quit Disk Utility and reboot your Mac as normal.

If unfortunately, you can't access First Aid in Disk Utility because macOS Recovery mode is not working, you can try Target Disk Mode.

It turns your troubled Mac into an external drive. Do this by connecting your troubled Machine to another Mac with the same OS or higher and restarting it while pressing the “T” key. Then you can open Dick Utility on the other Mac, select the troubled hard drive ((Which is the startup disk of the unbootable Mac) and click First Aid.

If First Aid found no errors and your Mac still starts up with a circle and a line through it, continue with the next movement.

Step 3: Back up files from the Mac and reinstall macOS

If First Aid fails to repair the startup disk, then it should be the incompatible Mac operating system that causes the prohibitory symbol on Mac boot. It happens when:

you upgrade to the latest macOS but it not compatible with your machine
the macOS build or version on your startup disk is damaged
you downgrade the system from Time Machine backup and cause software conflict

Then, you can only reinstall a macOS that work with your Mac models to fix the prohibitory sign on MacBook Pro, MacBook Air, iMac, and Mac mini.

However, you should know that macOS reinstallation could risk losing your data on the Mac. Your files could get lost or deleted sometimes, so make sure you have a backup of your data. If you don't, you can recover data from Mac froze on a prohibitory symbol first.

After your files are retrieved from the Mac that starts up to a circle with a line through it, or if you don't worry about data loss, you can move to reinstall the macOS.

What does a circle with a line through it mean at Mac startup?

Different from the Mac folder with a question mark issue, a circle with a line or slash through it means that your selected startup disk has a Mac operating system that can't be used by your Mac model.

To make it straightforward, Mac does detect an operating system in the startup disk, but it can't boot from that macOS version or build. And then feedback it with a crossed-out circle at startup.

Mac computers like MacBook Pro often boot into the 🚫 'Prohibitory sign' or other boot problems after macOS update. For instance, you update the system to macOS 11 Big Sur without checking the system requirements.

Some try to downgrade macOS Big Sur to older system with Time Machine backup, only to find that the crossed-out cricle at Mac startup due to incompatible OS.

So, the compatibility checking of the macOS and Mac models before upgrading is necessary.

Conclusion

After trying the fixing guide in this passage, you can restart your Mac or M1 Mac to see whether the annoying sign of a circle with a line through it has disappeared or not. Hopefully, you'll get rid of this prohibitory symbol when Mac is booting up.

Power Lines Down Mac Os 11

But if the startup disk is not detected in Disk Utility or by the macOS reinstallation wizard, it means your hard drive has failed and needs to be replaced. Or, you may want to contact Apple support for help.