Last update for anyone affected by this issue: this is fundamentally a design flaw. Temperature fluctuations cause the extremely small points of contact between each end of the cable and its respective connector to disengage. Unless the cable itself is truly kaput, reseating it often resolves the problem, but only temporarily. Allowing the machine to adjust to room temperature (after carrying it around outside in colder weather, for example) may also get the keyboard and trackpad working again. Tapping on the case beneath the spacebar, at the base of the trackpad or underneath the trackpad can also get the components working properly. But, again, this is not a permanent solution. I'm not sure if there is a permanent solution. And since carrying an external keyboard and mouse around with me is preposterous (imagine someone sitting in a cafè with a keyboard on their keyboard), I'm not going to deal with this anymore. It will be a long time before I consider purchasing another Apple product.
Hello! I ordered the IPD Trackpad Flex Cable (Item CMP-5726-UTW0) from Command Mac Parts.
To any of you possibly reading this and in any way invested in this cable issue, I did indeed replace the cable back in August (2016) and the machine worked properly until this last week of December (2016) when the problem returned. I'll either have to replace it yet again or move on to a new machine.
This trackpad cable is proving to be the last straw for me. Not a month off warranty, the keyboard and trackpad on my MBP stopped responding and replacing this poorly-located cable was the only fix. Three months later, I'm having the same problem, albeit intermittently, and I'm probably going to have to replace it yet again. It's not acceptable that this fancy product is sold as a pro-level machine. Frankly, Apple's new engineering ethos is an embarrassment and an insult to the industry, and yet when I look into the competition, I see much the same: fancy products designed to last just beyond the standard warranty. And don't get me started on port adapters. Such a shame.
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