The guy who set up that rack
should be taken out and shot. Lesson #1: All cords to hinged or sliding equipment need to be secured. Most rack mount keyboard/display units have a hinged or flexible arm just for this.
I did work for an electric utility where rack mounted relays had to be slid out for calibration. Before s substation had been commissioned, the relay techs found that the leads to the racks had been made too short by the electricians. They proceeded to take side cutters and lop off every cable to every racked relay. Then called the electricians to come back and try it again. Correctly this time.