My dvi is not working from old computer

Microsoft Windows 7 home premium
February 13, 2011 at 15:37:04
Specs: Windows XP, 4gp
I have a newer computer and an older computer both running xp.
I have a flat screen monitor with vga and dvi connectors.
On my newer computer I use the dvi connector.
When I hooked the older computer to the flat screen monitor it would not work on dvi but will work on vga.
The card I am using in the old computer has both vga and dvi like what is in the new computer. The dvi has the four holes surrounding the slot.
What do you think the problem is that I can not get the older computer to run dvi?
I would like to have it run dvi because I am planning to purchase another flat screen monitor with dvi and I want to make sure it works.
Any help will be appreciated.

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February 13, 2011 at 16:12:13
NOTE that you usually must use either the VGA connection or the DVI connection to a monitor if it has both types of ports - connecting both will not work.

If the DVI port on the older computer is the secondary port, not the primary port, you may need to enable it's output.

Connect a monitor to the VGA port.
Connect another monitor to the DVI port.

Boot the computer, and when the desktop screen has loaded, RIGHT click on a blank part of the desktop screen, select Properties.
Click on the Settings tab.

Hold your cursor over the two displays, one at a time.
Whichever one displays "Not Active", RIGHT click on it and Enable it or whatever.

You should have video on the DVI display.
Windows will retain that setting as long as that monitor is still connected to the computer's DVI port while Windows is running.

If that doesn't help you need to supply a lot more info.

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