If there are issues with your Mac that you think may be related to the hardware, you can run the Apple Hardware Test. Start up from Apple Hardware Test or Apple Diagnostics: D Click the arrow or press return on your keyboard.Release the option key when you see the Startup Manager window.Start or restart your Mac and immediately press and hold the option key on your keyboard.Please disable your ad blocker or become a patron to support the blog. Articles like this one wouldn’t exist without them. Update ( ): This article was last updated for MacOS 11 “Big Sur”, but should be applicable in older versions including MacOS 10.15–13. It’s just easier to walk through all the fixes instead of trying to figure out which specific issue affects your Mac. That is because they address three different keyboard layout issues. The above instructions may sound a bit weird and convoluted. But who knows? Maybe Apple manages to fix this issue sometime in the future. Macs with full-disk encryption (FileVault) seems more prune to run into this issue, probably due to how the pre-boot environment lives off to the side from the main systemd. My experience shows that this issue often reappears after MacOS updates on Macs that have experienced this issue before.
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