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Repair guides and disassembly information for the 14-inch MacBook Pro released in October of 2021, featuring Apple-designed M1 Pro and M1 Max SoCs. Model A2442.

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Three second boot loop

Hi there, I have a 14" MacBook Pro (2021) that starts up when connected to charger, but then restarts after 3 seconds, and repeats the cycle indefinitely. When disconnecting the "battery board data cable" it starts up perfectly fine being connected to the charger only.

Is this a clear sign that the battery board/battery is faulty, or could it also be that there is an issue with the main/logic board? I don't want to replace the battery just to find out that there is something wrong with the logic board. That would be very sad.

Thank you!

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Did you review this guide: MacBook Pro 14" 2021 Battery Replacement taking note of the BMU cable connections and the cable it’s self. I’m suspecting you need a new BMU cable as this one is likely damaged.

Battery management unit (BMU) flex cable P/N 923-06765

I would also install CoconutBatteryso you can see more clearly what’s happening.

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