IBM 704 - Manual (Page 37)

Starting the Server
3. Locate the keys; then, unlock and open the door. If the diskette
drive contains packing material or a diskette, remove it from the
drive.
4. If you installed any external devices, such as printers, plotters,
or modems, turn them on now.
5. Turn on the server.
To turn on the server, press the Power On/Off button. The
Power-on light comes on. The power-on self-test (POST) begins.
Power On/Off Button
Power-On Light
3
CAUTION:
The convex On/Off button on the front of the server
does not turn off the electrical current supplied to the
server. To remove all electrical current from the server,
you must unplug all server and power supply power
cords from the wall outlets.
Chapter 1. Introducing the PC Server 704 19