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How to short circuit the power button on a 2013 MacBook Pro

I spilt tea on my mac book pro, but was able to continue to use it with an auxiliary keyboard. However, I unfortunately turned it off and now the power button does not operate, this is where I originally spilt the tea.  Consequently, I have removed the optical drive from my mac as described by David Fear etc (so thanks to him and all those contributors) to access the connections on the power button, as described here MacBook Pro 13" Unibody Mid 2010 Keyboard Replacement

The twin cable leading to the power button is 0.4 mm thick and about 2 mm wide, the plastic covering appears to be transparent, the "wires" inside are black and I assume could be carbon, thus they could be what may be described as nano cables, the photo shows the underside of the power button, the twin cable and a ruler for size

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Can anyone advise me how to short circuit these cables to start the computer, could I use crocodile clips and or a probe to break through the covering and contact what appears to be the carbon "wires"?

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Note, although my mac is a 15 inch, the connections and components around the optical drive are the same as the 13 MacBook Pro, although the remainder of the logic board appears to be different.

EDIT: However, it may also be possible to use the 13 MacBook guide, given above, to remove the logic board on a 15" MacBook as the fixings look similar, you will just have to remove the additional fan in the 15" MacBook

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There's enough differences you need to follow the correct guides MacBook Pro 15" Unibody Mid 2012

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Most of the MacBooks have power pads which which you can short across to turn on the system. Basically, they are just the same points the power switch are wired too. On your system they are located near the keyboard cable connection on the logic board

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Lift the metal shield by unscrewing the two screws

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Carefully short across the two pads, it only takes a second to kick the system to turn on.

I would place your system in Target Disk Mode and then using either a FireWire or Thunderbolt cable connect your system to another Mac. Then you can directly copy off your systems stuff. If you have your new system you can use Migration Assistant so you don’t loose anything. If you can’t connect your two systems together get an external drive which you can make a TimeMachine backup, then use Migration Assistant to restore to your new system.

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Thanks Dan,

But I can't see anything like you pic on my logic board, this is the view of my logic board:

[br]

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Brilliant, I can see it now, it's eveing here in the UK so I will try it tomorrow morning when I am fresh and there is better light. Thanks very much for your help Dan.

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Thanks very much for your assistance Dan, it worked perfectly and all my files are still there.

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Go for a spontaneous reboot. Unplug the battery and MagSafe. Press and hold the power button for 10 seconds. Reconnect the battery and MagSafe. This should cause a spontaneous reboot.

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Thanks mayer, but won’ I loose all my files in memory, if I unplug the battery,?

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If your system is in sleep mode then your external keyboard should wake it so you can properly shutdown. If you've opened your system this far you should have disconnected the battery as its not safe working on a live system!

If the system is fully off you won't loose anything!

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Thanks Dan. So if Is it just a matter of disconnecting the battery as in step 3, here:-

MacBook Pro 15" Unibody Mid 2012 Battery Replacement

And leaving the battery in situ?

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Note, I am only want to start my mac to retrieve my files, as I will be buying a new mac.

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