Usb drawing too much power on my new ipod 7.

when i plug in my "lightning cord" i get an error message that goes a lil somethin like this:
Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled.
To prevent damaging your computer, the USB device drawing too much power has been disabled. Other devices may have also been disabled. When you disconnect the device drawing too much power, your other USB devices will be enabled again.
i was just trying to use my brand new out of the box ipod nano 7.
any help is appreciated.
i'm running an imac with mas os x 10.7.5 2.5 ghz intel core i5
and a new out of the box ipod nano gen 7.
thanks

Hi, is that plugging it directly into a USB port on the iMac?
Do you have any other Bus powered things connected to the Mac?

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Plugged my iPhone to do my usual download of photos off my phone into my iPhoto library so that I can edit them and post on eBay and Etsy. Suddenly, I'm getting the error message:
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Meanwhile, for tonight I'll have to do just email the photos to myself. Ugh.

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Usb drawing too much power on my new ipod 7.

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