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A1418 / EMC 2833 / Late 2015 / 3.1 GHz Core i5 or 3.3GHz Core i7 Processor. Released October 13, 2015.

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Why is my computer shutting down?

My Mac has been shutting down. These are my power settings.

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Ran this command log show --predicate 'eventMessage contains "Previous shutdown cause"' --last 256h

Filtering the log data using "composedMessage CONTAINS "Previous shutdown cause""


as provided by @johnaaragon.

Skipping info and debug messages, pass --info and/or --debug to include.

Timestamp                       Thread     Type        Activity             PID    TTL

2019-10-31 05:32:46.846428-0500 0xb2       Default     0x0                  0      0    kernel: (AppleSMC) Previous shutdown cause: -128

2019-10-31 20:12:07.810892-0500 0xb2       Default     0x0                  0      0    kernel: (AppleSMC) Previous shutdown cause: -128

I uninstalled a kext from Snagit because I thought it might be the cause.

would love to find out what my next steps may be.

Bu soruyu yanıtla Ben de bu sorunu yaşıyorum

Bu iyi bir soru mu?

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What is your macOS version presently? Did you run the on board diagnostics?

Did you try wiping the drive (reformat it & installing a fresh copy of macOS)?

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I am running 10.15.1 (catalina) I haven to done a refresh. I am planning on doing so. I have reset my NVRAM and SMC. This random shutdowns carried over from 10.14 but I still had snag it installed back then.

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The best thing here is to create a USB OS installer drive to redo the drive. Of course make a TimeMachine backup of your user accounts, apps & data so you can restore them later.

Catalina is still a bit buggy! So make sure you apply all of the updates afterwards or just go back the Mojave for now.

You will want to boot up under it using the Option key to enter into the Startup Manager

Then delete all of the partitions via Disk Utility and then reformat the drive to GUID with APFS file system. Then re-install macOS.

Bu yanıt yardımcı oldu mu?

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I tried a full wipe/format etc and does not fix the problem. -128 can be memory or battery from my research. I have done a battery check, memory check, and hd test I had a fault on my hard disk but was able to repair that. my battery is only charging to 60 percent off its capacity, and ram checks seem all good. so for me its likely a battery or power fault. will take to apple store to see if they can give me a more definate result

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@Michael Walsh - Did you boot up under the external boot drive? If you don't you won't fix the V-RAM container which is where the issue is. APFS is a radically different architecture from HFS+ Which is why you need to nuke the drive fully. If you run Disk Utility from the recovery partition then you won't do a full reformat.

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