Power Lines Down Mac OS

Have you ever had a need to shut down your Mac, but, for one reason or another, you couldn't actually do it? You might be wondering how that could be—consider a situation where you've left your work machine on, so you can use Remote Login (in the Sharing System Preferences panel) to login to it later from home. While driving home, your recall that maintenance was going to shut down power to the building this evening—and there's your Mac, sitting there with 15 open applications, innocently awaiting its impending power failure. You could, of course, turn around and drive back to the office. But assuming you've got another machine at home, and have enabled remote login to your work machine, you can just continue on home and shut down your work Mac from there.

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If you've planned ahead, you've enabled remote GUI control by using the Sharing System Preferences panel—see this Mobile Mac column for more detail on how to set that up. Assuming you've done all this, then you can just connect to the remote Mac's GUI, and pick Shut Down from the Apple menu.

But what if you're not so good at planning, and you've only left the machine with Remote Login enabled? Then you'll want to use the Unix command fittingly named shutdown. This command will shut down the remote Mac, and it has a number of useful options.

Connect the power adapter to the Mac On the keyboard, hold down the Shift + Control + Option keys AND the power button at the same time Release all keys and the power button simultaneously. The charging light on devices with MagSafe adapters may change colors, indicating that SMC has been reset. How to Shutdown Mac from Command line After Certain Time If you want to shutdown a Mac from Terminal after a specified time, you can do that easily using the command below: sudo shutdown -h +60 After that, you will be asked to enter your password and confirmation that your Mac will be powered off in 60 minutes (in our case). In normal use on a notebook, pressing the power button without holding it down is the same as choosing Shut Down from the Apple menu; either way, you see the dialog box below. (Apple changed this in OS X 10.9 Mavericks. To see this dialog box you have to hold down the power button for a few seconds.) On a desktop, the shortcut is Control+Eject.

Here's how it works. First, you must connect to the remote Mac, typically via ssh, which is enabled using the Remote Login option of the Sharing System Preferences panel. This also implies that the remote Mac must be reachable through any firewalls that might exist between the two machines. On the machine being used to shut down the remote Mac, you'd type something like ssh -l username 12.34.56.78, replacing username and 12.34.56.78 with the proper user name and IP address for the remote machine.

Once you're connected, you need to execute the shutdown command as the root (superuser) user. But before we shut down the machine, let's look at some of the various forms of shutdown.

• shutdown -h +10 'Shutting down soon!': The -h option tells the system to shut down; +10 means in 10 minutes; Shutting down soon! is the message any users who have Terminal open will see.
• shutdown -h 0612082000 'Shutting down at 8:00pm tonight': Instead of specifying the relative time until shutdown, you can specify the precise time, using the yymmddhhmm format, and using a 24-hour clock for the time.
• shutdown -r +15 'Rebooting in 15 minutes': The -r option reboots, rather than shuts down, the system.
• shutdown now: Shuts down the system immediately.

Very important: Keep in mind that, although this will give you a 'clean' shut down (the system will make sure that everything happens in an orderly manner), anything running in the GUI will simply quit—even if you have open documents with unsaved changes. Let me repeat that: unsaved changes in documents open in the GUI will be lost! .

There are other scenarios where this trick is useful, too. One that comes to mind is using it to safely shut down if your display goes kaput. Just remotely login from another Mac and use this command to shut the machine down in a safe manner.

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

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.

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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

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• 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. Cardtography mac os.

Here's how it works. First, you must connect to the remote Mac, typically via ssh, which is enabled using the Remote Login option of the Sharing System Preferences panel. This also implies that the remote Mac must be reachable through any firewalls that might exist between the two machines. On the machine being used to shut down the remote Mac, you'd type something like ssh -l username 12.34.56.78, replacing username and 12.34.56.78 with the proper user name and IP address for the remote machine.

Once you're connected, you need to execute the shutdown command as the root (superuser) user. But before we shut down the machine, let's look at some of the various forms of shutdown.

• shutdown -h +10 'Shutting down soon!': The -h option tells the system to shut down; +10 means in 10 minutes; Shutting down soon! is the message any users who have Terminal open will see.
• shutdown -h 0612082000 'Shutting down at 8:00pm tonight': Instead of specifying the relative time until shutdown, you can specify the precise time, using the yymmddhhmm format, and using a 24-hour clock for the time.
• shutdown -r +15 'Rebooting in 15 minutes': The -r option reboots, rather than shuts down, the system.
• shutdown now: Shuts down the system immediately.

Very important: Keep in mind that, although this will give you a 'clean' shut down (the system will make sure that everything happens in an orderly manner), anything running in the GUI will simply quit—even if you have open documents with unsaved changes. Let me repeat that: unsaved changes in documents open in the GUI will be lost! .

There are other scenarios where this trick is useful, too. One that comes to mind is using it to safely shut down if your display goes kaput. Just remotely login from another Mac and use this command to shut the machine down in a safe manner.

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

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:

It is recommended to run a free scan with Combo Cleaner - a tool to detect malware and fix computer errors. You will need to purchase the full version to remove infections and eliminate computer errors. Free trial available.

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

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• 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. Cardtography mac os.

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/*

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Volley gosh mac os. 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: