I can't boot from OS install USB drive Mac Mini Model 1176

How I can't boot from OS install USB drive, Mac Mini Model 1176

Thank you Eustace Mendis for your answer.
I rebooted the Mac Mini holding the Option key down but it doesn't work. I used an USB drive with O.s 10.7 from Apple that I have used previuosly with other computers and I also tried with a CD install O.S 10.6
It seems that the Mac Mini can't recognize the keyboard inputs and I tried with 3 different keyboards but still didn't work.
I also reset the SMC and PRAM but I had no luck. Any clues?

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    Message was edited by: hooddy
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