Many similar questions I've read here have to do with backlights not working at all or when dimmed.
My problem is that the number 6 key is not illuminating. All other keys are working as they should.
Any ideas how to diagnose and fix this?
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Unfortunately, unless a SMC reset doesn't work (Shut down -> Press Shift-Control-Option and Power Button at the same time for 10sec -> release keys -> Press power button), it is a hardware problem. If it's under warranty, Apple should fix it, if not, a 3rd party repair shop should be able to fix it for a reasonable price.