Imac won't boot when usb plugged in

Hi all,
I have a probleme since i got my Imac 27 Mid 2010. It just dont boot when a usb Drive is plugged in. I had i Firewire hard drive in the past and i had no problems to boot up on it. Turn the mac on, holding option key and bang !  BUT usb just dont work, it stay on gray screen and after a while (10 mins) it boot on my regular internal drive.
I tried several usb drives and it's always the same. It look's that im not the only one that have this problem.  I bought this fantastic Machine but i cant make a rescue clone and that driving me crazy !!     I think my situation is not ''NORMAL''
Thank's all

SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
   (this reset depends on the 5 second timing for it to work)
PRAM RESET
Zap the PRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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