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I have XP SP3 with a GeForce 8400gs and it has a DVI and VGA port on the back. I have one monitor plugged into the VGA and another monitor plugged in DVI via DVI to VGA adapter. Either monitor works in the VGA port, but neither monitor works in the DVI port. My PC (HP Compaq) doesn't even recognize that I have a second monitor plugged in. I went through Windows troubleshooting and uninstalled and reinstalled the NVIDIA driver, and I'm now at a loss as to how to get the PC to recognize the second monitor. In Display Settings tab, I don't even have the option to "extend the display" to monitor #2, because it doesn't think monitor #2 exists. Any help would be appreciated.

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Are you using the HDMI port too? –  Zero Stack Feb 12 '13 at 0:09
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Not very helpful, but the 8xxx series has some design flaws and tends to die in interesting ways. I had a 8800 that stopped working (well I didn't think to try the VGA socket) one day, and a 8300 that generally acted odd. The card might be dying, and unless you want to try baking it, it might be worth planning for a replacement. On the other hand, has the DVI ever worked? You might have plugged in a passive adaptor inti a DVI-D socket instead of a DVI-I one –  Journeyman Geek Feb 12 '13 at 0:11
    
It is also possible that the DVI port is defective ( unless i misread your post ) –  Zero Stack Feb 12 '13 at 0:11
    
Thank you for your comments. 1. Not using the HDMI. 2. The card could be flawed, or the DVI port could be defective, however I just took it out of the box about 2 hours ago, so I'd hate to think it was broken when they shipped it. If the card was flawed, wouldn't the VGA port be acting up as well? –  VerbMinx Feb 12 '13 at 0:16
    
The DVI port of the 8400gs is probably not defective. It probably only has digital signals on the DVI port, and there are no VGA signals for a DVI-to-VGA adapter. –  sawdust Feb 12 '13 at 0:17

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