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Originally Posted by chrisridd
Instead of just restarting your Mac, try shutting it down and then booting it again. That resets more of the hardware.
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No joy... BUT!!!!...
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Another thing to try when you've shut down is - if the Mac has one - an SMC reset. This sometimes helps unconfuse hardware. SMC resets are only possible on some Macs, so you'll have to google for specific instructions for your Mac model.
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Well, that did it. Sort of... I have a 6yo Mac, so it's not technically an SMC reset, but the SMC reset support page also mentioned (for older Macs) shutting down, unplugging for 15 seconds, replugging, and turning back on, and - for absolutely no reason I understand - that solved the problem.
