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Having just updated to Big Sur 11.2 - upon reboot my USB Apple extended keyboard will not work. I have tried all available USB ports on the back, I have even used the convenience port on the keyboard which still has pass through to charge my iPhone... but I am not able to input any keys, or turn the caps lock on or off... mainly type in my password!!
iMac 5k late 2015
iMac Line (2012 and Later)
Suport were unable to find a solution to my problem - and advised to set up a return. Totally stumped them that Bluetooth assistant didn't start up - or no input dialogue box appeared upon restart.
I am however, now typing on the iMac!! Unplugging the power cord and reinserting it whilst holding down the power button seems to have somehow got the USB keyboard to work... Only issue is that the Fan is running at what sounds like boost level!
At the moment I can do what I need to do with the extra noise before trying to work out how to stop the fan from being on boost!
Suport were unable to find a solution to my problem - and advised to set up a return. Totally stumped them that Bluetooth assistant didn't start up - or no input dialogue box appeared upon restart.
I am however, now typing on the iMac!! Unplugging the power cord and reinserting it whilst holding down the power button seems to have somehow got the USB keyboard to work... Only issue is that the Fan is running at what sounds like boost level!
At the moment I can do what I need to do with the extra noise before trying to work out how to stop the fan from being on boost!
Trying to find the small Apple Bluetooth keyboard I thought I had... it’s strange that this is upon reboot from updating Big Sur!
I have also managed to wake the computer from black screen using some of the keys on the keyboard, but no luck getting any input to show in the password field box
Well now with everything unplugged and the bluetooth (old school) keyboard turned off. Rebooted the iMac...
I do not even have the No keyboard input found box, in order to start trying to pair the keyboard... mouse still works
This is particularly confusing and becoming frustrating now 😩.
Even if I try and manually put the keyboard into pair mode by holding the power button on, it just flashes green with no confo of connection
Yes, this is a USB Apple extended keyboard. I have had no problems what so ever until rebooting from the 11.2 update ! Weirder still is that I was able to pass through power to an iPhone though it’s ‘convenient port’ whilst trying to work out what was going on
I had to find an Apple extended USB keyboard I still have. It's working fine with my late 2015 5K iMac which is running Big Sur 11.2. I suppose it's possible your keyboard has a problem. Maybe someone else will have an idea.
Well I have unplugged everything. Turned off the Bluetooth mouse, turned off the Bluetooth keyboard. Re powered up the iMac and it just starts up with my password box flashing...
It should come up with a dialog box saying no input detected surely?!? Whether no keyboard or mouse is found, seeing as everything is unplugged or switched off...
putting a call into Apple 🤞🏻
Yeah, nothing... cpu and gpu were all at 97% idle... reset the SMC, fans stopped powering on... but then the USB keyboard stopped working! 😖
luckily had paired the bluetooth keyboard before this...
reset the PRAM using Bluetooth keyboard- which got the USB keyboard backup and running— until a restart, knocked it out again 😤
Currently reinstalling Big Sur - something has glitched this system and it’s not they keyboard or the logic board I’d imagine?!
I think, you have to contact an authorized Apple Dealer on this case.
Do you have another keyboard you can try? It doesn't have to be an Apple keyboard.
It is a little strange. Especially with a USB keyboard. You didn't say, is this an Apple USB keyboard?
One other thing, if I remember correctly the keyboard came with a USB extension cable. You could try using the keyboard with or without the cable. Assuming you still have it.
K. Good luck.
Glad you got the keyboard working. As far as the fan, you can check Activity Monitor > % CPU to see what's causing the fan to run up.
Keyboard not working 11.2 iMac
