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I just removed the backplate and used a can of compressed air to clean it.

What is Previous shutdown cause: - Apple Community

From Apple Support Communities. The shutdown cause is related to the hardware issues. For example it may be related to RAM, although some people suggest that it can be also related to battery time span it surpassed the end of its life , so basically it tells you that you shouldn't re-cell this battery due to proprietary circuitry that protects the battery.

Therefore you should try to plug in your Mac into a power source and check whether it helps. Then install Coconut Battery app to find out the state of your battery, if it's fine, then it could be some issue with your logic board. Keep in mind that code is a general unknown hardware error "catch all" code , so it can be anything else. So in general you should:.

Shutdown Cause -128

Mine has been with Apple for a couple of weeks now, with this problem. They've reproduced it with a full rebuild of the software from scratch, so at least they now acknowledge it wasn't anything I was running and is hardware related. They're suggesting most likely a logic board to correct the problem. Not sure I'm going to shell out that much on my mid MacBook Pro 15" but I'm plenty pissed about it. Shutdown cause is an unknown shutdown cause. That means the system doesn't know what's the reason why the computer shutdown. Thank you for your interest in this question.

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Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Would you like to answer one of these unanswered questions instead? Sign up to join this community. When a Mac starts up including following a restart or wakes from sleep, the reason for the previous shutdown or initiation of a restart or sleep is reported in the log. Unfortunately, Apple considers these reasons to be of no concern to the user or system administrator, so they are given as numbers, and Apple does not release information on what the numbers — cause codes — mean.

In El Capitan and earlier versions of OS X, you can find recent cause codes in your logs using Console: search for shutdown cause or sleep cause. In Sierra, Console does not support access to previous log entries, and cause codes do not appear in system. You should then see entries similar to I have shortened these for convenience : Cause codes which are negative refer to hardware causes originating mainly from the SMC, and those which are positive refer to software.

A special code of 0 indicates an intermediate, which can occur when there is sudden loss of power on some systems, or for system sleep when a laptop goes into SafeSleep to preserve its remaining reserve battery power. I am grateful to Graham Perrin and others who revealed this information on StackExchange and elsewhere. This is what happens when power is removed to the machine, and can indicate faulty power supply including from the wall or faulty logic board.

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MacBook Pro (mid 2014) 15" Retina - Unexpected Shutdown / Random Shutdown

I am sure that there are more, but I cannot suggest an explanation for yours. Did you run hardware diagnostics? I got 3 of the the last 20 days, so now when I can look for it, I will likely find out what it means by observations. The full command would be like this.

The numbers in which I'm most interested

The search might take quite some time to start the output and to finish. Why not use Consolation — so much simpler! Did you really retrieve log entries from more than 10 days earlier? Much of the time my log only goes back 5 days or so. Well: that has changed. I just looked back in my log, and can retrieve default level entries, such as Time Machine backup details, for 20 days.

When I checked this back in March, they were only retrievable for a few days. I presume this has changed with Sierra updates. I get Previous Shutdown cause: on High Sierra, started in single user mode I get black screen on boot on most other modes.


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Managed to run diagnostics once, and everything seems ok. Fsck on single user runs ok and does not modify anything. But then it continues and I can safely move around the disk in single user mode with no issues. Recovery mode connects to internet recovery mode, it downloads stuff, reboots to the apple and progress bar, and mid-way, reboots as usual to black screen and boot sound.

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Did this result from the I wish you success, Howard. Shutdown Causes macOS 9. Leave a Reply Cancel reply Your email address will not be published. Nobody seems to know what these codes mean but you. Where did you get this list? What versions of macOS are you using? Today I got a cause: 1 also…. Any thoughts on what represents?

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Do you have any idea what the problem is? I also have the code of But it says here in my mbp 15 This does not indicate an issue with your system. Check the power button if you did not perform a hard shutdown yourself. It could be the case that the power button stuck down and forced a shutdown. On a laptop, the Mac should hibernate before the battery becomes so discharged it is unable to shutdown correctly, therefore if you see this shutdown cause on a laptop it may indicate a hardware issue with the battery or with the battery controller for reading the charge.


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  • Hold D on boot to run Apple Diagnostics and follow the instructions if any errors are found. If the issue persists, make an appointment at an Apple Store. Back up your data, erase the disk and reinstall macOS. If you continue to run the system, data loss may ensue. Use Time Machine to keep a backup until you are able to erase and restore. A common symptom is being unable to repair with Disk Utility — as such, erasing the disk is required as mentioned. Troubleshoot for stuck application, startup item and any loading preferences.