Wired Keyboard shuts off after login

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Wired Keyboard shuts off after login

There is an interesting quirk that I have encountered with multiple mac computers and multiple OSs for years now, after logging into a Mac after a reboot the wired keyboard shuts off and stops working? I logged in using it, so it worked up until then?

The only thing that seems to bring it back is to pull all the USB plugs out and plug them back in, in random ports until the keyboard (the only thing not working, everything else is) decides to turn back on.

iMac 27″, macOS 10.15

Posted on Jun 23, 2020 8:13 AM

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Answer 1

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rkaufmann87

Level 10

143,856 points

Jun 23, 2020 8:50 AM in response to DSharp22

Please reset the SMC several times with all external peripherals disconnected. If the problem persists, test to see if it's a peripheral causing the problem (it happens sometimes) and if all peripherals are okay then try another USB keyboard.

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Answer 2

rkaufmann87

Level 10

143,856 points

Jun 23, 2020 11:46 AM in response to DSharp22

Okay, please attempt resetting the NVRAM and restarting in Safe Mode. Also connect ANY USB keyboard into it to test that keyboard, to see if it's the computer or the keyboard itself.

How to reset NVRAM on your Mac

Use safe mode to isolate issues with your Mac

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Answer 3

SeaPapp

Level 7

26,486 points

Jun 23, 2020 12:22 PM in response to DSharp22

I don't believe that simply unplugging your iMac resets the SMC, if that were so Apples instructions would state exactly that. You should reset the SMC according to Apples instructions How to reset the SMC of your Mac - Apple Support

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Answer 4

DSharp22 Author

Level 1

8 points

Jun 23, 2020 11:26 AM in response to rkaufmann87

Thank you for the response, however this happened when I turned the iMac on after unplugging it during the previous night's thunderstorm to protect it from a potential power surge. (It was unplugged and off the whole night.) From my limited online research that should have reset the SMC correct?

If so, the SMC in theory was reset and the keyboard issue happened on the next two boot ups/logins.

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Wired Keyboard shuts off after login

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