Wired keyboard suddenly stopped working.... help!

I have just turned on my iMac to find the Bluetooth Set-up Assistant trying to "locate a keyboard" even though there is one plugged in and was working perfectly fine when I last shut down. I have tried all 3 USB ports at rear of iMac and the keyboard is still not recognised but the mouse works. I am currently using a keyboard from an older Mac that works fine so is there anything I can do to get the computer to accept the new keyboard again? Thanks in advance for any help!

Hi, try the SMC Reset route..
Then Repair Permissions...

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