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

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Trackpad unresponsive while everything else (keyboard etc.) works fine

I got a MBP late 2011 with an unresponsive trackpad. Thought that I could fix this replacing the trackpad. But with the new (and definitely functional) trackpad the MBP refused to boot. Disconnecting the trackpad everything was fine (except the trackpad of course). I tried another trackpad just to make sure it was not the problem, same result. Any good hint to solve this?

Update (11/26/2017)

Thank you for your suggestions. Being busy with other things I only came back to the MBP today with some more testing.

Looking at the logic board connector I could not find any damage.

For further testing I left the trackpad untouched and just changed the connector cable. With the "original" cable the trackpad does not work, everything else is fine.

Substituting the cable for one which definitely works, the MBP cannot be switched on any longer, the attempt to do so gives only a short signal, but the machine cannot be turned on. This is true regardless whether de cable is connected to the trackpad or not.

Remove the cable from the logic board and everything (apart from the trackpad of course) works just fine.

The AHT does not report any problems.

Any more hints? Thank´s in advance.

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Did you replace the cable with it?

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Yes, I did replace the cable together with the trackpad and then the cable only. The cable seems to fine, the problem continues as soon as I connect a functional trackpad.

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Take the battery out and see if the problem persists.

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You'll need to take some pics of the logic board trackpad connector as it clearly is the issue. Post them here so we can see as well.

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OK, I took a couple of pictures, but I do not know how to post them on this site. Thank´s for some instructions.

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Using a magnifier do a detailed inspection of the logic board connector. I suspect you have a damaged pin. Post a few pics if you see something off.

Update (11/28/2017)

Well, the logic board connector looks OK which what I had expected would have had a damaged contact. Clearly it's not that.

So what is it?? At this point I'm thinking you have either a defective trackpad or the wrong one for this series. Make sure you got the right one.

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As mentioned above it is not the trackpad but the cable. I tried two different connector cables that work in other computers with the same effect: connect it to the logicboard and the computer will not start regardless whether the trackpad is connected or not.

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Wrong cable then

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Before you rip apart your laptop, check to see if it was disabled in settings.

Go to System Preferences > Accessibility > Mouse and Trackpad

If that doesn’t work, internally restart it by pressing the Shift-Control-Option Keys and the Power Button all at once, then release. Good luck!

EDIT: Make sure to shut down your laptop, plug in the power cable, and then restart it before attempting the last fix.

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I tried everything on the software side including these hints. On top of that the behaviour of the MBP indicates a hardware problem - trackpad not working with one trackpad cable, replacing the cable the MBP wouldn´t even start. But thank´s anyway. I appreciate any help.

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Very strange. My best advice is to keep searching for possible fixes, but so far your best bet may just be taking it to an authorized service center.

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Norbert estará eternamente agradecido.
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