Do NOT use the VGA cable. Only use the digital DVI cable for video. Using the DVI cable connect one end to the DVI
connector on the monitor and the other end to the DVI connector on the video card. You should NEVER connect
cables to both connectors on the monitor. The only rare exception is if your monitor can support switching
between two video sources such as using one monitor alternately for two computers. I have only seen one
monitor support this.
The only other cable you need to connect is the power cable.
When your computer boots the monitor should check both analog VGA and digital DVI inputs for a signal from
the video card. It should automatically select the right one after a brief search. Most monitors should work
this way. Only on rare occasions should you have to set the input manually using the setup program built
into the monitor.
A lot of video cards now days have two connectors. They are either:
1) VGA connector and DVI-I connector, or
2) Two DVI-I connectors
The DVI-I connectors are special connectors that are normally used with DVI input of LCD monitors. They also
can be used with a VGA monitor input (either CRT or LCD) by using a DVI-I to VGA adapter. This adapter is
normally supplied with most video cards that have a DVI-I connector.
The following is a typical video card:
The VGA connector is on the left. The DVI-I connector is on the right.
With the two connectors on the video card you can use either one or two monitors at one time.
The left VGA connector can be used with a VGA cable only. You can use it to connect to either an analog VGA
monitor or a LCD monitor using its VGA input connector.
If you use a DVI cable with the DVI-I connector only the right 24 (3x8) pins on the right of the connector
are used. These contain digital-only data for a DVI connection on an LCD monitor.
If you use a DVI-I to VGA adapter with the DVI-I connector only the 4 pins on the left are used. These
contain analog-only data for a VGA monitor connection. With the adapter then you can use a standard VGA cable.
The following is typical LCD monitor video connections:
The left video connector is a DVI (aka DVD-D) connector. Note the absense of the 4 analog pins seen on the DVI-I
connector on the video card. These are not needed because this input is digital only.
The right video connector is a standard VGA monitor input.
Note 1: the DVI connector is sometimes missing on low end LCD monitors. You can only use analog VGA cables
with these monitors since they have a VGA connector.
Note 2: You must NEVER use both the VGA and DVI connectors on an LCD monitor at the same time.