New iMac 27" won't reboot with USB devices attached

I have a 3 day old 27" iMac, that I dearly love. However, I noticed when I reboot and I have any external HD's attached via USB, it will not reboot. It gets to the white screen and hangs. I can pull them out and hit the power switch and it will boot normally. Any suggestions?

I have had my 27" I7 iMac for less than 24 hours and after several attempts at migrating my home folder and applications from my 3 year old iMac 24" running 10.6.2, I am having the same problem with the white screen.
When I finished migrating all my stuff, I hooked up my D-Link 7 port powered hub that has 2 250Mb drives and 1 500Mb dive (for Time Machine) to the new machine and it just hangs on the white screen.
I have to press the power button on the back to shut down and when I restart it just hangs, so I removed the one cable (for my D-Link) from the back of the iMac and it would boot as normal. When it boots I can then plug my D-Link back in and all is OK.
I don't think this has anything to do with the disk format as this setup worked perfectly from my 24" imac, never once froze.
Not sure how to get round this as it's going to be a real pain to have to remove the usb cable every time I want to boot up.

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