USB DEVICES DISABLED!  Please help!

Whenever I connect my printer to my Macbook Pro [MacBook Pro (13-inch, Mid 2012)] it always says:
"USB Devices Disabled
Unplug the device using too much power to re-enable USB devices"
I tried shutting down my mac a lot of times, (control+optin+shift+power button), the one with using the P and R keys, downloadinga new driver and also even buying a new cable that connects the printer to my mac. I'm really tired and have been worrying about this for a while now. I need the printer for uni. Please help me. Thank you very much.

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