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Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB GDDR5 Video RAM

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Do I need a new laptop?!

My macbook pro was working fine, I left it charging overnight and went to turn it on and it wouldn't boot up. It alternates between a black screen with just the disk drive sound, and freezing at the same point every time at about 5% on the boot loading bar.

I've tried booting from an El Capitan flash drive and it does the same thing, freezing on the loading bar. I took it to the genius bar and they did a hardware test and said everything was working, but then said it was unfixable and probably a problem with the logic board (£500).

Is this the end of the line or is there anything else I can do before having to buy a new laptop?

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I took the laptop to an independent mac repair store after the problem failing to be diagnosed at the genius bar.

Turns out the problem was one faulty RAM module and 500 reallocated sectors on the hard drive (probably not the issue but not great either).

I've now replaced the faulty RAM and am in the process of putting in a new hard drive.

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May not be the end of the line! ;-}

This is a early symptom of a failing tantalum capacitor in the dedicated GPU power logic. During the boot up the system starts off using the internal Intel Iris graphics services then switches over to the dedicated GPU (you'll note the gray screen changes hue a bit thats the switchover) Here's a good YouTube vid on how to fix: MacBook Pro GPU Fault: C9560

If you're not to doing this your self there are a few Mac specialists with the proper tools and skills to fix this for you.

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4 Comments:

Thanks Dan! I will look into the cost of this as I don't trust myself to start soldering circuit boards. I don't know if this makes a difference but I ran the hardware test and it came up with the error 4mem/62/40000000. I understand this to be a RAM failure but I tried using different RAM and it didn't help.

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If it's a 2012 model, it won't be C9560; this is the issue on 2010 models where it will randomly kernel panic.

Your issue is more than likely GPU, CPU or RAM related, rare on 2012 models but have seen some with that problem. Try booting with one (known good) RAM stick in a slot, then try the other. If it still has the same issue, and there is no visible liquid on the logic board, I would not suggest repairing it since it would not be economic most likely.

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@reecee - The cap is the same in the 2011 & 2012 models

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@danj C9560 definitely doesn't exist on the 2012 boards, I think it might on the 2011 boards, but all issues with freezing on those are GPU related. The C9560 failure causes kernel panics due to drops in the GPU voltage and slight slowness when using the GPU; I'm afraid it won't be the issue in OP's case since this capacitor isn't on the 820-3330 boards.

No easy fix for this one I'm afraid, most likely the GPU, definitely something miserable nonetheless :(

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Chilliring will be eternally grateful.
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