Intel-iMac Keyboard not working...

So I've had my Intel-iMac for a year and some change now and have had no problems until today when my keyboard stoped working. I have tried plugging into different usb ports but nothing. Each time I plug into a usb port the caps lock light does flash. I've also plugged my roomates keyboard and that keyboard does does work. If anyone can help it would be much appriciated, thanks!

Does your room mate have a mac as well? If so I'd plug your keyboard into his. Sounds like it might be time to get a new keyboard, but it's worth trying it on another machine to make sure that it is definately that the keyboard has died.

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