USB Keyboard just stopped being recognised

Hi
I have an iMac 2.8 i7 that is running os x 10.6.8
I have an Apple USB keyboard connected to it and everything has worked fine for several years
I booted up the iMac today and was greeted by the Bluetooth Keyboard Setup - no wireless keyboard connected message and "Check cables if you are expecting a usb keyboard."
I have tried rebooting and using different USB ports on the back of the iMac but no luck
I have tested each USB port with USB pen drives - each port recognises these devices - so the iMac ports appear to be working for other devices
I have tested the keyboard on my MacBookPro - and it works fine
I have tried resetting the SMC (powered down, unplugged, held power button for 15 seconds, plugged back in and rebooted) and the USB keyboard is still not working.
I haven't installed any new software or updates recently.
Any advice would be much appreciated
Thanks in advance

Reset the SMC and PRAM, it would not hurt to reset the SMC 2-3 times back to back. Post back after trying, the directions are in Intel iMac SMC and PRAM resets

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