Using USB to charge external cell phone

I have a Motorola Q cell phone, which I've successfully recharged in the past using its accessory cable plugged into a USB port in our former HP computer. I presume everything was USB1 due to its age. I now have a new iMac and none of the USB ports, either on the back of the monitor or on the keyboard, will charge my phone whether it is turned on or not. I thought I read in David Pogue's book the USB ports would work with both USB1 and USB2. Or, is there not enough power coming through the iMac to do the job? Would an external, self-powered USB hub do the trick? Help!
Message was edited by: MrsB_621

MrsB_621, Welcome to the discussion area!
Would an external, self-powered USB hub do the trick
Yes.

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