LG 57M - Manual (Page 9)

A6
Installation
The supply voltage is marked on the ID label located on the rear
panel of the monitor. If your local voltage is different, do not use the
monitor and contact your supplier before using the display.
Connections
To connect your monitor after the video adapter is properly installed:
1. Turn OFF the power to your computer and all its attached options.
2. Position the monitor and the computer so that you can easily
get to the back panel of each.
3. Connect the signal cable with D-sub connector to the graphics
board on your PC as described in your PC Owner's Manual.
4. Tighten the screws on the video cable connectors to keep them
from coming loose and to prevent radio and TV interference.
5. Connect the power cord to the AC receptacle on the back of the
monitor. Plug the other end of the power cord into a properly
grounded electrical outlet.
6. The socket-outlet should be installed near the equipment and
should be easily accessible.