Won't boot to Target Drive when holding "T"

My iMac won't go into Target Disk mode when I power up and hold down the T key. I am using a newer Apple thin keyboard, but the same thing happens with the original Apple keyboard. It will, however, go to target drive if I use a Kensington keyboard. This is a machine that came with Tiger and that I upgraded subsequently to Leopard and then Snow Leopard. I suspect that there is a Kensington driver or setting hiding somewhere that is preventing the hardware from recognizing the keyboard early in the boot sequence. But I don't know how to find it.
If you have any suggestions, I would appreciate it. It goes to target drive just fine from System Preferences + Startup Disk, but that is cumbersome and adds a step to my routine.

Hi Malcolm. You totally helped me solve my problem.
I figured out, through your questioning, that the new 'flat' Apple keyboard I bought came with a disc to alter system preferences and accept the new keyboard.
When I took my computer to the Genius Bar recently, they used a different keyboard.
I plugged in my old keyboard and the restart-"C" worked pefectly. THANKS so much for poking around with me on this. I would have been stumped if I hadn't thought it through, with your help.
Now I just need to figure out how to get another copy of the keyboard install CD- because I've misplaced it. So back to the old keyboard for now. THANKS again, man! Dan

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