Model A1502 / 2.4, 2.6, or 2.8 GHz dual-core Intel processor / Released October 2013

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Random crashes and slowdown

Hi everyone,

I recently got a lot of troubles with my MBP, some random crashes especially when looking videos or opening a lot of programs. But it also happens after the computer exits sleep mode.

Now, when I launch it, I need to press the power button until the loading bar appears. If not, the computer shut down after the "bong".

I ran a Etrecheck analysis and I always have the "battery failure" (Error 79) corresponding to the crashes. Why ? It also happens when battery is unplugged.

Here is the Etrecheck report :


Answered! View the answer I have this problem too

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Lets try a simpler and free tool to check your battery. download this gem: coconutBattery

Take a screenshot of the main screen so we can see it fully and post that into a new answer window, then do an update to your question.

Also check your MagSafe adapter and its connections. Follow this Apple T/N: Apple Portables: Troubleshooting MagSafe adapters


According to coconut battery, everything is alright, battery's fine with a bit less than 400 cycles.

The biggest problem is : when I boot the computer, kernel_task is already at more than 240% of CPU using.

Yesterday I created a new admin account and the problem vanished. But here it goes again.

I tried smc and pram reset with no effect. Reinstalling the OS too. I'm starting to run out of options.


OK so yesterday, I cleaned up the computer, and tried to reinstall Mavericks, not Sierra.

Kernel_task vanished so I was able to use my computer normally. Before sleeping, i closed my MBP so it can be in sleep mode. When I took it back, the computer was completely shut down.

The same issue as before occured again, I need to press the power button until the loading sign appears so that the computer can boot normally.

And again, this stupid kernel_task is eating more than 300% of the CPU activity. This is seriously p****** me off.

The computer is not overheating, the battery's fine, I tried 3 different OS, safe mode is affected too, tried VRAM/PRAM/SMC reset. I've tried all.


I am experiencing the exact same crashes. I have replaced both the battery and SSD. So it couldn't be a virus? Did you ever solve the problem?


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You may have a virus. I would recommend you make a fresh backup (don't over-write any older backups) using TimeMachine.

Download if you don't currently have it the OS installer app. and follow this guide: How to create a bootable macOS Sierra installer drive. Once you have a working installer USB thumb drive, boot under it and do a full security erase so both partitions are deleted and scrubbed one pass will do. Then install a fresh copy of your OS (use a new user name here).

Once you get the OS installed get a good antivirus app to check your backup. Then use Migration assistant to recover your stuff.

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