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Original post by: LikeARabbit ,


More than likely the top case connection isn't seated properly.  I would disassemble it again and make sure to push this connection in until it feels solid.  It's a bit awkward to do the first few times so I wouldn't doubt that it might be loose if you haven't removed the top case a few times.

[guide|515|Step 12 in this guide] shows the cable I speak of.


Before re-assembling the Mac I would try to power it on, just to make sure it works before you reinstall all of the screws.