OUTPUT USB DEVICE

Hello,

I keep getting this error.

" To prevent damaging your computer, the USB device drawing too much power has been disabled. Other devices may have also been disabled. When you disconnect the device drawing too much power, your other USB devices will be enabled again."

I'm using a imac , which is about 8 months old. the only thing i have plugged into a usb port is a Bose soound equipment

and it was working fine untill some days ago it just keeps poping up for no reason and now it doesnt let me connect to the bose system..

i just keep getting this obnoxious popup.

any idea how to resolve this?