MacBook Air, Keyboard, Trackpad

The Keyboard and Trackpad are unresponsive.

Here are the things I have tried over the past few months.

1- Update OS X to Yosemite

2- Reset PRAM

3- Reset SMC

4- Replaced Cable from Keyboard to Motherboard

5- Replace TrackPad

6- Replaced Keyboard

7- Updated Firmware

The power button is intermittently responsive.

I have to start the MacBook Air by shorting two contacts on the logic board.

I have disconnected the battery and reconnected.

Does the battery play a role in grounding or completing a circuit?

Are their hardware troubleshooting steps I can take?

I have also run the AHT and checked the system report, both state the computer passed inspection.

Any suggestions? Or resolutions?

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At some point I gave up on this Mac and subsequently lost the screws for the lower body. I ordered and received screws yesterday. I put them in and bottom is secure, looks great.

Today, TrackPad and Keyboard stopped working once again.

I have this suspicion it is a grounding issue. Even so, I would not have any idea how to fix it.

Suggestions? or Fixes? Why would that make any kind difference?

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Deck the Halls
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Was there a liquid spill resulting in undetected logic board damage?

Since the machine force boots (and you've replaced all the usual suspect parts) I believe either you've damaged the keyboard ribbon connector, or not completely aligned and inserted the ribbon cable - its a tricky task (track-pad and power button also run through this).

There is a cam lock on that connector it must be unlocked before removal and relocked after. A technique I found useful is to use some blue painters masking tape to create a sort of handle or strap that allows me to lift and guide the ribbon back fully into the connector.

If you've damaged the ribbon cable connector either a computer/small electronics shop (or someone skilled in logic board component repair) must replace it, or, the usual DIY solution would be to replace the damaged logic board.

If this answer is acceptable please remember to return and mark it accepted.

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