There are also other glitches that can happen, including bugs that are undiagnosable. #Unresponsive macbook updateIt could be a system update that has gone wrong because of the power going out in the middle of the process or a virus attack that targets macOS. #Unresponsive macbook macThe point of this answer is the sequence of troubleshooting steps and the eventual conclusion that it’s a keyboard hardware failure.There are times when despite our best efforts, our Mac encounters errors due to some unforeseen circumstances. I’ll nevertheless attempt to fix the current one for use as a spare once the replacement is in. This is my primary Mac and i’m an author, so i need to go with a fully functional keyboard. Sad that there seems to be one factory in China making all the replacement keyboards that everyone sells, and that this replacement allegedly does not have the Apple original build quality and feel (and one report of a dimmer Caps Lock LED). For me, it’s a hardware issue: keyboard problem. What is really weird is that sometimes mashing down (multiple simultaneous presses, not high force) other nearby keys (the others which intermittently fail) along with the D key will reactivate them both-interesting key matrix stuff going on there, i’m guessing. It’s become so bad that during the course of typing this message, i’ve had to attach an external keyboard. There may be thermal effects involved, and i do eat at this machine so even though i don’t recall any spills, there may be chemical contamination/degradation from a past event. Tried a different clean OS (High Sierra): not only did that not help, suddenly all of A, S, D, F, G were problematic (coincidence or related to earlier work), with D remaining the worstĭid not do a PRAM zap today, but did one several weeks ago to cure this issue, with no improvement.Tried a clean OS (same version: 10.12 Sierra) run off an external backup drive: did not help.Tried a different OS user account: did not help.Removed and reinserted the internal keyboard cable connector at the logic board: did not help.Would come and go, and be perfect for weeks. Sometimes nearby letters would do the same thing. Hold it and sometimes it will start working with no change of pressure and no even slight movement whatsoever. D key has been very intermittently flaky for awhile. Just going through this with my 15” MacBookPro9,1. I spilled no liquid into it, but a low amount of cleaning product could have leaked in there. So, having the ribbon removed (again) and keeping the cap in place without removing it (i didn't want to risk to break it - there was a lot of stock superglue keeping it in place- I raised on side with a needle an I have dried it with hot hair from a small hair dryer, being careful to don't get it too close or too hot. I was able to see a little bubble while pressing. At the end, after a very close inspection, I found out that the small silicone cup has a sort of liquid drop into it. I was already considering to replace the keyboard with a cheap one from eBay but before, I tried swapping the ribbon system taken from another standard key, doing deep cleaning with rubber alcohol and a lot of compressed air and hoover to be sure not even a residual debris was in there. Sometimes additional pressure made it work, sometimes simply nothing. #Unresponsive macbook proHi, I had an intermittent A key on my Macbook Pro Late 2011.
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