USB message when IPhone plugged in to MacBook Pro

I have a MacBook Pro running Lion. When I plug in my IPhone 5 a message appears saying one of the USBs is overloading the system and it needs to power down. I've checked all connections.
I'm running a Cinema screen from the laptop and two printers, one wirelessly and the other by USB cable from the laptop.Ive got a keyboard and mouse running from the back of the Cinema screen. The Iphonevdcable also runs from the back of the screen.
What to do?

Universal Serial Bus ports have a power limit of 500 milliamps. Although USB ports are useful for transferring data and using various peripheral devices, if any USB device attempts to draw more than the allotted 500-milliamp limit, the port will register a power surge. USB power surges may disable the USB port for further use, and can cause permanent damage to your motherboard.
http://www.ehow.com/how_6907230_fix-usb-power-surge.html#ixzz2ZMycxqTO
You need to remove every USB connected device before you do permanant damage to your computer if you have not already. I would shut it down and have it checked out by Apple before further usage.

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