Apple Power Macintosh 9600 - Manual (Page 5)

2 Connect the monitor power cord to the monitor.
On some monitors, the cord is already attached.
3 Plug in the monitor power cord.
Some monitor power cords are designed to plug into the back of your
computer.
Some monitor power cords must be connected to a grounded electrical outlet,
not to the computer. Check the information that came with the monitor.
Monitor power cord Monitor power socket
5 Setting Up Your Computer