Iphone charges, but not recognize by itunes

Hi folks, yesterday evening, randomly, when i plugged in my iphone, iTunes & iPhoto did not recognize it !? I use to plug my iphone in the USB port of my keyboard, but since yesterday, my computer says that the connected device is asking to much energy !?!? When I plugged in my computer directly, it charges but it is not recognize by the 2 apps mentionned above... Any clues ?!?
Thanks
Marc

If you can see the iPod as a hard drive in MyComputer, then this might help:
http://discussions.apple.com/message.jspa?messageID=1548774#1548774

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