Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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Shuts down during boot...

My Problem is as follows:

1) the MacBook swtiches of w/o warning during boot

2) any of the "standard" procedures (SMC-reset, etc) don't help

3) Apple Hardware test runs (fans at full speed) and shows not errors

4) booting while pressing any (?) key (I tried with shift, D so far) boots the system up with fans running at full speed, key always pressed

5) fan control programs like smcFan Control do not see any fans or temperatures

6) as soon as I realese the pressed key the system switches of almost immediately

Any ideas?

Answered! View the answer I have this problem too

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Can you give us your exact model you have. Look at the bottom of your system for the serial number and paste it here: EveryMac - Lookup then paste the systems URL here for us to see.

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It could be quite a few different causes. can you please give us some background on what proceeded. Did you get your system wet or spill something into it?

Update (01/04/2017)

Here's the IFIXIT guide to get to the keyboard: MacBook Pro 13" Unibody Late 2011 Upper Case Replacement. It's a bit of work and you still need to disassemble the keyboard from the uppercase.

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I found out that disconnecting the internal keyboard "solved" the problem. I.e., the MacBook works normally with an external keyboard. It is, however, difficult to start-up with the power button disconnected. Anyway, I hope replacing the internal keybord helps.

Btw, it is a MacBook Pro "Core i5" 2.4 13" Late 2011

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So it appears something was spilled into the keyboard then. Yes, its time to open it up and replace the keyboard and you might also need a new trackpad as well.

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Hans Rudolf Schmidt will be eternally grateful.
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