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A1706 / EMC 3071—Released in November 2016, this 13" Macbook Pro introduces the OLED Touch Bar. Features a dual-core "Skylake" Intel Core i5 CPU and four Thunderbolt 3 ports.

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MacBook Pro sat unused for months, and now will not power on.

Hi there!

I have a late 2016 MacBook Pro that has probably been used in total 20-30 times. It had sat for somewhere around 6 months without being used/charged at all. Upon going to use it, it did not power on. Obviously, my first course of action was to put it on the charger. After giving it about an hour to charge, I came back to fire it up. Still dead. There was no sort of start-up noises coming from the computer, no fans kicking on, and no click on the trackpad.

After leaving it on the charger overnight with no progress, I brought it to a local shop that fixes mainly Apple products. They replaced the battery with 2 different new ones. It was able to turn on after that, but only because they had charged the battery on an external charger before putting it in the computer. Once that battery lost its initial charge, the computer won’t power on anymore. I was able to have the computer running, as long as the power cord was plugged in (still running off of the initial external battery charge). The second I unplugged it, the computer shut off and I haven’t been able to start it since. This makes me believe that the problem is not the charging cord or any of the power outlets.

They told me the computer could require a new motherboard, but that it would cost roughly $500 to order. I was hoping that somebody else had an idea of what it could be before I went and dropped that kind of money on a fairly new (and hardly used) computer.

Thank you for all of you help in advance!

John

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If your system is running now lets do an SMC reset How to reset the SMC in a MacBook (and why you might want to). This guide covers both the older and newer MacBook Pro systems. See if that helps.

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I tried the SMC reset and nothing happened. I can't get it back to running since I do not have an external battery charger.

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You don't have the USB-C charger your system came with? Just use it.

If that fails to work I would recommend you just bring your system into Apple at this point when they reopen.

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I do have the USB-C that came with it. The guy at the local repair shop said that they had taken the battery out of the computer, and externally charged it with whatever kind of charger they were used, and put it back in. However, when I plug the USB-C into the computer, no power gets to the battery to charge it. I was wondering if there is something that regulates the charging, or for lack of a better term, some type of "middle man" between the charging port and the battery, that could go bad causing it to not charge.

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The problem with direct charging of the battery is the system is not designed for that.

Lets look at this like a flashlight... You have two or three batteries in-line (series) so when you use your flashlight the sum of the batteries 1.5 + 1.5 = 3.0 Volts. But lets look at the NiCad/Li-Ion chargers they don't charge the batteries in this mode they charge the batteries (cells) each independently! In this case one battery alone! What can confuse is the charger often requires two batteries to enable it. But the charger should be monitoring the charge load per each battery independently that way you don't over charge one cell.

OK, so lets look at your battery it is setup in the same manor! Each cell is wired to the next so you need to break the connections between the cells which in a sealed battery destroys it!

But why is charging all of the cells at once a problem? Well this gets into one or two cells may be bad or not able to be charged at the same rate as the others. The MacBook Pro's battery has technology within it that combined with the SMC within the logic board can manage the charging. But, you went around it! So we don't know what damage their external charger did, hopefully it didn't damage anything.

You can blame Apple here as they hold their cards real tight! So we just don't know what they designed. IF we did we might have a way to do this using a breadboard charger setup.

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I wish I could offer you a better answer,

Sadly you need to get your system to Apple to be properly repaired.

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