Keyboard not responding at startup on iMac.

I'm currently using an Apple aluminum keyboard (with numeric keypad) and when ever I boot my iMac on this keyboard, I am completely unable to select my boot volume which makes it impossible to start up Bootcamp in my windows partition. I do most of my gaming on Windows as well as other leisurely activities but ever since I brought my iMac to the Apple store in march, I have been unable to select windows from startup making me have to go onto OSX and select it via the control panel. A genius at the apple store successfully selected my OSX from a different keyboard meaning that it's not the computer but the keyboard itself.
How can I get my keyboard to work at startup without having to buy a new one?
Help in this situation would be wonderful

If it works with another keyboard, it is obviously a problem with your keyboard, as you said yourself. If the iMac is still under the one-year warranty or AppleCare, you should be able to get a new one, assuming there is no sign of an accident, like liquid being spilled on it.
A few things to confirm... The keyboard should be connected directly to the computer, not to a USB hub. Try it on a different port, if you have not already.
Do the basic trouble-shooting procedures: run +Repair Disk Permissions+ in Disk Utility and reset PRAM
http://support.apple.com/kb/HT1379
But if your computer worked fine at the Apple Store, those last two trouble-shooting actions probably will not help, since it worked when another keyboard was used.

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