Wired keyboard bringing up bluetooth error message

[scouser75]

Hi guys, I have a wired keyboard on my Mac Pro running El Capitan. But I randomly get the following message and my keyboard doesn't work. I DON't have a blue tooth keyboard!!

"Blue Tooth Keyboard Setup. There isn't a keyboard connected..... "

I've tried the trick of using a USB extension cable, which worked for a few months, but now this also doesn't work. Even if I plug the keyboard straight into the Mac Pro tower, rather than to the monitor, it still doesn't work.

Any suggestions please? I've tried resetting the SMC / PRAM but no luck.

 

[LuisN]

Try with another keyboard. If it works, problem solved if not connect to each of the USB ports front and rear. If the problem still remains check the USB ports with other devices, i.e. a mouse, to see if they work. I'm assuming the correct kexts are loaded

 

[scouser75]

Thanks LuisN. Alas, I don't have another keyboard to try. But I did try my keyboard with a PC and it works fine on it. Its just the mac it doesn't work on. I've also tried all the USB ports - back of monitor and on the tower too.

What are kexts? The keyboard works sometimes. Then sometimes nothing! I have to turn off and on until it works.

 

[LuisN]

Thanks LuisN. Alas, I don't have another keyboard to try. But I did try my keyboard with a PC and it works fine on it. Its just the mac it doesn't work on. I've also tried all the USB ports - back of monitor and on the tower too.

What are kexts? The keyboard works sometimes. Then sometimes nothing! I have to turn off and on until it works.

kexts are the "drivers" for your Mac devices. It may be some hardware problem with your USB ports or some software that causes some sort of conflict.
If nothing solves your problem I advise you to make a bootable backup of your drive and reinstall El Capitan over your current boot disk, it will replace any "drivers"and system files without causing loss of data. DO BACKUP BEFORE!!!

 

[scouser75]

kexts are the "drivers" for your Mac devices. It may be some hardware problem with your USB ports or some software that causes some sort of conflict.
If nothing solves your problem I advise you to make a bootable backup of your drive and reinstall El Capitan over your current boot disk, it will replace any "drivers"and system files without causing loss of data. DO BACKUP BEFORE!!!

Thanks Luis. Is it not possible to just replace drivers without reinstalling the entire software?

 

[LuisN]

Thanks Luis. Is it not possible to just replace drivers without reinstalling the entire software?

Yes you can but I don't know what kexts, if any, is doing this.
Installing "over" will only replace macOS, it WON'T replace or ERASE anything else. Your Applications will remain installed and funccional, nevertheless I advise you to make a backup or cloning the disk just in case something goes wrong.

 

[scouser75]

Thanks Luis. I'll carry out a backup and update the software. But first need to find my install disc

 

[LuisN]

Thanks Luis. I'll carry out a backup and update the software. But first need to find my install disc

Follow the instructions intros page to get the last version with valid certificate:

How to download and install macOS - Apple Support

Download and install current or previous versions of the Mac operating system on compatible Mac computers.

support.apple.com