IMac i7 27" not recognising/charging USB connected iPhone4 with iOS4.1

I just bought an iMac 2.93Ghz Core i7 27" Screen, to do some iPhone app development on.
Problem is:
When I connect my iPhone4 (iOS4.1) in any one of the USB ports, the new iMac fails
to acknowledge it or start to charge it. The ports work happily with
wired keyboard, mice and powered external Hard drives.
My iPhone4, when plugged into the USB port of my older iMac Core Duo 20" (10.6.4)
gets found and starts charging almost immediately.
One extra bit of info, my wifes iPhone4 (iOS 4.01) when plugged into the new iMac does
get found. So I starting to think there is an issue between the versions of iOS for iPhone4
that makes iOS 4.1 not be recognised on my iMac i7.
Has anyone seen anything similar or could cast some light one this?
I've also done a PRAM and SMC reset in the hopes that they may help, no luck.
Thanks
Asim
p.s is there any (non-jailbroken) way to downgrade my iOS4.1 to workaround this?
Message was edited by: asimu
Message was edited by: asimu

Welcome to the Apple Discussions!
Is your iPhone by any chance configured by a PC?
Dah•veed

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