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Macbook pro Mid-2012 - Keyboard not working (Space and Caps lock only works) - Doesn't switch on using battery, when I remove the battery connector from board and Plug on AC it boots. I had recently changed the HDD to SSD myself.

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  • This answer is worth a try.
    – Vili
    Commented Mar 16, 2020 at 19:58
  • That’s not just a bad answer to the original question @Vili. It’s based on a guess and is irrelevant to this question
    – Allan
    Commented Mar 17, 2020 at 7:45
  • @Allan I agree the linked answer is speculative, but it does offer some free troubleshoot.
    – Vili
    Commented Mar 17, 2020 at 16:26

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If it doesn’t boot with the battery connected it could be because...

  • the battery is acting as a drain because it’s losing charge faster than the charger can charge it
  • There is an issue with the battery charging circuitry not switching between the mains and battery power correctly

This one is easy to test; simply get a new battery. If the problem remains, it’s the Mac itself.

As for the keyboard, you likely need a new one. Simply plug in a USB keyboard and if it works properly, you’ll need a new top case assembly. If it doesn’t, the logic board (USB bus) is dead/dying.

Given the age of this particular Mac and it’s problems, if you can source good used parts inexpensively, you might get some life out of it, but likely it’s time for a new(er) one.

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Well it looks like I hadn't connected the keyboard ribbon properly, also I cleaned the ribbon.. Voila now it works..!

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    Remember to accept your own answer if that was the solution that worked for you
    – Vili
    Commented Mar 18, 2020 at 17:40
  • May I ask you: what did you use to and how did you clean the ribbon ? I have a similar problem.
    – user324426
    Commented Sep 25, 2021 at 1:58

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