USB device has exceeded the power usage

I own a Dell D800 Laptop w/standard USB ports I have connected 1 web cam and 1 cooling fan plate only ,on different usb ports but I am still getting this same error message stated here above please help if at all knowledgeable about this common issue Thanks!
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More about device exceeded power usage
  1. That cooling fan plate may require more power than the USB can provide. Try to see what happens without it.
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