IBM F50 RS/6000 7025

6. If you have a modem or fax machine attached to the system, disconnect the
telephone line.
7. Unplug all power cords (cables) from electrical outlets.
Note the location of the following; then disconnect them from the back of the
system:
 Power cord
 Display cable
 Keyboard cable
 Any other cables and cords
The back of your system looks similar to the following.
5-12
IBM RS/6000 7025 F50 Series User's Guide