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Procesador Intel Core i7 de cuatro núcleos a 2,2 GHz (Turbo Boost de hasta 3,4 GHz) o 2,5 GHz (Turbo Boost de hasta 3,7 GHz) con 6 MB de caché L3 compartida.

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MacBook Pro goes into boot chime loop when the battery is plugged

Hi all, my macbook suffers from a rather strange problem.

One time after a full charge of the battery it showed the “No battery“ sign, and I naturally plugged it to the charger . I left it for a good 20/25 mins to get some power , but once i pressed the power button it went into a rather strange startup chime loop where the chime repeats itself forever. At first i thought i had to reset the NVRAM, so i did it, no success, after that i tried every other possible way of recovering a dead Macbook without opening it /PRAM Reset,Safe mode, SMC Reset, etc./. The only strange thing is that i managed to boot the login screen after a NVRAM reset once, typed my password and the loading bar stucked to the middle. It did this every time i tried resetting the NVRAM. I read through every thread here, and basically all of the internet.

However i managed to open the back panel and after i plugged out the battery to make the manual SMC reset, i plugged the charger but forgot to plug the battery back and the laptop booted completely normally /it felt slower because every MBP downclocks the CPU when the battery is unplugged/.

I read somewhere that the EFI Flash Memory might cause this issue, or the SMC chip, but i still cant be 100% sure.

It’s the first time something like this happened to my laptop, 2 weeks ago I went for a thermal paste change and dust cleaning at a local service , but it has been workin fine until this problem occured. Brought my laptop there after this problem occured, and they couldn’t even diagnose the problem and im kinda left without much options.

If someone here has encountered this problem and probably found the solution i would be grateful to hear it.


*EDIT*: Adding a screen shotfrom CoconutBattery by Dan’s request, kinda pointless because the battery is unplugged and the laptop doesnt get any info from it, anyways here it is:

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Lets get a better handle on what's happening here, install this gem of an app CoconutBattery take a snapshot of the apps main window and post it here for us to see make sure the MagSafe charger is plugged in Agregar imágenes a una pregunta existente

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You mentioned most of the troubleshooting steps I would have performed except one: reset NVRAM followed straight away by booting into internet recovery as per https://support.apple.com/en-us/HT201314 Additionally you can try running the Apple Diagnostics (https://support.apple.com/en-us/HT202731)

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@deadcapacitors oh, I forgot to mention that i tried all of the recovery modes after the NVRAM reset and still no succes :/

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Can you plug the battery back in and this time boot up in Safe mode, press the Shift (⇧) key when you restart. Sorry I forgot that piece, that should allow you together over the boot loop.

Reference: Mac startup key combinations

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@danj Tried this also, but i cant get past the boot loop (with the battery plugged in the connector)

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Then your battery comm link to SMC has shorted out. Did you use a metal too to lift the battery connector from the logic board? Thats what I suspect happened here. Your logic board and maybe the battery as well got damaged.

Time to get your system to someone with the deeper skills to fix your logic board. You may need a new battery too.

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I lifted the connector with plastic pliers, as you say its some deep logic board related issue. And im going to search for somebody that does this level of logic board repairs. I'll update as soon as I can get something out of this situation.

As of the battery, i dont think i'll might have to change it, because when I actually managed to go past the boot chime and go to the log screen /with the battery plugged in and starting the laptop with the NVRAM reset/ it showed that the battery is holding its charge.

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