Just installed an Epson stylus SX435w. But the usb cable prevents input from my keyboard ?

Just installed an Epson stylus SX435w. But the usb cable prevents input from my keyboard ?  When I remove the printer usb, and then remove and re-insert the keyboard usb my keyboard works again. Any thoughts on what is causing the problem?

Keyboards  and mice are low power devices.  Put your printer on a separate USB port from the keyboard and mouse.  If you have to, buy a wall powered USB hub to have multiple USB devices on your Mac.

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