Firmware upgrade for keyboard failed now keys won't work

Hi
Hope someone can help, I recently upgraded my sisters intel imac and during the aluminium (USB) keyboard firmware upgrade it failed and now computer doesn't recognise keyboard keys but usb hub on keyboard that mouse is plugged into works fine. Another keyboard works fine which was handy when trying to type in the passwords to try to re update.
I have tried the following
1) searched discussions found advice on resetting nvram, and in open firmware (which on further research doesn't seem possible on this imac?) did control, option P R on start up.
3) EFI firmware upgrade was successful
4) have used disk utility to repair permissions
5) Looked in system profiler and keyboard usb hub is recognised but no keyboard. When another keyboard attached it recognises this fine and is in the system profiler
6) checked all usb ports
Main question - can I fix or do I have to get a new keyboard or perhaps it would be less stress, time wasted etc to just buy a new keyboard???
thanks
G

Hi, if the K/B is under warranty Apple will replace it FOC..Call Apple Help or ->
call in at the local Apple Store or Apple Approved Service Agent.

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Firmware upgrade for keyboard failed now keys won't work

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