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2.2 GHz (Turbo Boost up to 3.4 GHz), 2.5 GHz (Turbo Boost up to 3.7 GHz), or 2.8 GHz (Turbo Boost up to 4.0 GHz) quad-core Intel Core i7 processor with 6 MB shared L3 cache and an optional AMD Radeon R9 M370X dGPU.

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crwdns2933897:0crwdne2933897:0

My computer is boot looping in a strange way

I have just finished doing a few repairs to my MacBook. I replaced the keyboard, removed the battery and left speaker, and wiped off the anti-reflective coating.

When I press the power button, it will either

briefly have fan spin.

Or

I get a chime, full fan spin, and a hot processor, nothing else. This only last a few seconds until it turns off and does the same thing again. Plugging it into an external monitor shows nothing, but it causes the computer to stop turning off even once I’ve unplugged the HDMI cable from the computer.

These outcomes alternate every time I unplug the charger and plug it back in. Very strange.

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crwdns2933897:0crwdne2933897:0

hi Mate.

Very odd indeed. I am going to assume you kept the old battery disconnected during the process.

Did you attempt this with all the fancy mac key combos?

Did you try this on the charger?

Did you try swapping back to the old battery (if available)?

Try swap the old components and see if that works because different parts for slightly different model variants can be down to different pins or software.

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Originally, the laptop didn’t show any signs of life other than a brief fan spin. I then reset the SMC and PRAM which led to the behavior I talked about in the post. All of this was done with the battery removed and the computer plugged in.

I have just tried it with the old battery. When connected, I hear a chime and then the fans slowly ramp up. The same thing happens when the computer is plugged in. After testing it with the battery, I removed the battery and the computer now shows no signs of life. Resetting the SMC and PRAM does nothing.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Ouch,

Sounds like some kind of niche issue. Doesn't mean it's not fixable, I think it just means something has blown. Check if any of the chips are blown/fried or, when attempting to power on, if anything gets overly warm indicating a short.

If that is to no avail, then if you have any other board around, start swapping components. Also, i'm not sure about this but if you have another macbook pro with an ssd and this one with an SSD, try swapping the two drives to see if software is the issue.

If that is still to no avail, then I am afraid something has gone terribly wrong. I do have a 2015 13" if you need to figure out stuff across the force touch retina models but otherwise that's all i can really do.

Good luck :)

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