OptiPlex 745

Hi GJackson242,

The pictures have said it all. Thank you for posting them!

There is a video card attached to the computer. Here look at the red highlighted rectangle below.

This white port inside the red highlighted rectangle is called the DVI port. This port sends out video signals and works exactly like the VGA. Now, either you need a DVI cable which you can plug it into the white color port on the back of the tower here and then other end to your monitor; provided if your monitor has this DVI port as well like it does for VGA.

If your monitor does not have the DVI port then either you need to get a monitor which has a DVI port or purchase a DVI cable. Now, if you do not want to go with either of these options, then you need to open up the tower and take this highlighted video card out and automatically the VGA port will be activated. This is how computer works. If you plug in a video card, it disables the in-built video card by default and you have to take the video output from the card. When you take the video card out, the default in-built Graphic Card gets activated automatically.

I would suggest, get a DVI cable if your monitor has the same white port on its back. How does a DVI cable look? Refer to the picture below.

NOTE: DVI Cable comes in different variants. When you go to purchase one, ask for Dual-Link DVI cable as your card has Dual-Link DVI. How do I know that? This picture below will answer this:

Hope this helps.