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I updated my iMac's OS to Yosemite 10.10.5 and found that the Apple USB keyboard is no longer working.

I tried different USB ports to no result.

I tried using the keyboard on another computer and it works fine.

I tried an Apple Bluetooth keyboard and it works fine.

Would anyone know what I could do to get it working again?

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Try this, while it is very basic: https://support.apple.com/kb/PH19094?locale=en_US Also check what other USB are working (mouse, etc.) Do a PRAM Reset Restart > Command + Option + P + R holding the keys when the Apple sign doesnt appear yet on the screen, it restarts and USB ports start working.

You can also try a SMC: https://support.apple.com/en-us/HT201295

I am using a new iMac with El capitan and preferred using my old USB keyboard instead of the elegant wirelerss one. No problems.

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