Prompt keeps popping up interupting work

All of a sudden I'm getting "! Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled..."  This prompt keeps appearing - I disconnected my printer but that doesn't help. I have my cable modem but I can't disconnect it - I have not added any additional USB devices.. Why is this happening?

All of a sudden I'm getting "! Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled..."  This prompt keeps appearing - I disconnected my printer but that doesn't help. I have my cable modem but I can't disconnect it - I have not added any additional USB devices.. Why is this happening?

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