MBP disconnects IPhone everytime saying the USB is drawing too much power?

Hi Guys,
Today I went and bought myself a new Mac Book Pro 13".
Tonight I've been transfering all my files over from my old MacBook and everytime I try to connect my IPhone 3GS by USB to my Mac a message comes up straight away saying "A device conected to your computer is drawing too much power, apple has disconected this device to prevent damage occuring to your computer"
I have tried to connect my phone numerous times while it has been conected to the power cord and also running on battery.
It also took my new Mac a good half an hour to recognise my external hard drive was connected and let me use it..
I have had this problem once or twice with the same IPhone and my old mac so im thinking it may be a problem with my phone considering it is 2 years old now?
But then again, my old mac that is nearly 4 can still connect to my phone when my new MBP can't.
Any help would be appreciated.
Thanks,

Use a self powered USB hub.
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents

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When I plug a USB extender cable to any USB port on any Mac tested so far, I get the warning:
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¡Hola, Gabriel!
USB Overcurrent Protection issues arise when one or more of the USB devices draw too much power or, by adding a device to a USB hub, one exceeds the current budget for the entire chain. A detailed explanation can be found in this article, where it states:"Should the cumulative current drawn by a group of downstream ports exceed a preset value, the overcurrent protector removes power from all downstream ports. Overcurrent circuits are used to protect against catastrophic device failures, software errors that lead to devices turning on when the current budget has been exceeded, and user-caused events such as the shorting out of connector pins."See also "USB: Hub Description" for important information on self-powered vs. bus-powered UBS hubs.
Your Apple Pro keyboard is a bus-powered USB hub. Some displays continaing USB ports may act as either bus-powered or self-powered hubs: one has to consult the display's documentation for details.
• If USB Overcurrent problems arise using a bus-powered, third-party USB hub, try a self-powered hub or connect the USB device directly to one of the built-in USB ports on the computer itself.
• If USB Overcurrent Protection issues arise when a device is connected directly to one of the built-in USB ports on the computer itself, then the peripheral device or its cable is either damaged or defective.
Note that you can not put two bus-powered hubs in series. In addition to the article "USB: Hub Description", see also "Apple Pro Keyboard: Devices Connected to Hub May Not Work."
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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:
"Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled."
I'm surmising that it's because my USB cord (connected from my iPhone to MacBook Pro) might be damaged. It's not charging correctly. Keeps going on and off when plugged into wall or computer.
So, will buying a new cord this solve the issue? I have to get one anyway so I guess I'll find out!
Meanwhile, for tonight I'll have to do just email the photos to myself. Ugh.

It should fix it. I would unplug all of your other USB devices from the computer and see if it continues with that error. If so, then certainly replace that cord (do it anyway since its having issues even in the wall)

MBP disconnects IPhone everytime saying the USB is drawing too much power?

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