123.hp.com/ojpro6978 - Instant Hp Officejet Pro 6978 Printer Setup Guide, Driver Install Setup, hp officejet pro 6978 wireless setup & Resolving 123hpcom setup 6978 Printer Issues.Unpack the printing machine from its packaging and keep the power cables ready to connect to it. Place the cords firmly into the wall sockets so that no loose connections or power problems exist with the devices.