Is it a powered USB port?

Usually if it's connected directly to the PC or notebook, the answer will be yes.

However for most extenal devices that have their own USB ports, those ports will not be powered. An example of this is the two USB ports on the front of the G15 - they provide USB connectivity, but are not powered. In other words you can't charge an Ipod or cordless mouse with them.

Cheers,
Stealthy