Question about Pine Technology XFX GeForce 7950GT, (512 MB) PCI Express Graphic Card

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Second monitor no longer detected by NVIDIA GeForce 7950GT / on Vista

I've had 2 monitors (Acer AL1916W) for about a year, working fine. Yesterday when I turned my computer on, the 2nd monitor was displaying "no signal". Only one monitor is listed in the device manager, and going to the NVIDIA control panel and trying to "force detect" fails to detect the 2nd monitor.

It's not a problem with the monitor - any monitor plugged into the primary slot works fine.

Yesterday I tried various things, such as updating/rolling back drivers, disabling the Vista theme, and trying to do a Windows "repair installed" (which failed), and eventually the 2nd monitor worked for no apparent reason. Well, I went to bed, and today when I turn my computer on.. it's broken again. Only this time fiddling around did NOT randomly fix it. (And I'm not really sure why it was fixed the first time)

I rely on using both monitors for my work, so if anyone has any ideas, I would appreciate it.

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  • KingBunny Sep 23, 2008

    Yes, they're using DVI from the graphics card. Yes I have tried swapping the cables and booting in safe mode - only the one plugged into the main slot works, no matter which monitor it is.

    They worked for the first year until they randomly stopped for no apparent reason. Then they randomly started working again after I fiddled around. They next day, they stopped. Then I played a full screen game, and accidentally minimized, which fixed it again. Then this morning, they weren't working. The game fix didn't work, so I restarted the computer.. and now they work again. Seems completely random. I have no idea how permanent the current fix is.


  • rjklindsay Nov 23, 2008

    Since last week I tried connecting a TV to the S-Video port on my Samsung X50 laptop with ATI Mobility Radeon X600 GPU.

    The laptop screen went black, and ever since then the Vista ATI WDDM drivers will only work with an external screen. I formatted the drive, reflashed the bios, replaced the screen and reinstalled Vista, but halfway through the vista install, the screen goes black, and I have to plug in an external screen to complete the installation. Only if I disable the ATI drivers and use the Safe Mode generic drivers, the screen turns back on. The screen and GPU work just fine under XP and Linux though.

    It seems either I've damaged some Monitor plug and play function that only Vista uses, or the Vista ATI drivers store some settings in the bios or somewhere else?

    Linux is still able to detect the correct resolutions for my monitor though.

    Any advice would be appreciated.

  • doozcoopey Jan 17, 2009

    I have the very same problem than kingbunny: also with a geforce 7950gt + acer 2016W. Please let me know if you find an anwser ; thanx.

  • MCP2k Feb 20, 2009

    I'm having the same problem w/ NVIDIA GeForce 8600 GT. It's not the video card or the drivers, it's a Vista issue. Been using this PC for over a year with dual 22" Viewsonic monitors and occassionaly connecting to the PC using remote desktop from my laptop. 4 days ago I connected to the PC remotely and the next morning my dvi monitor is no longer active. The great part of the problem is when I reboot, the system starts on the dvi monitor and during the Vista boot process it switches to the analog monitor and the dvi is not available. Has anyone found a solution yet?

  • whitee56 Apr 15, 2009

    Dual monitor setup was working fine and then like the other post the second monitor went dead. Both pluged into DVI slots. Card is plugged into the PCI Express slot which my mother board has 2 of. No matter which one I plug tthe card into the same problem presists. Tried all the normal fixes. HELP

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A quick question, Are your monitors using a DVI output from your graphics card?

When was the last time you remember them both working, and what display driver was you using?

have you tried swapping both vga/dvi cables round and booting in safe mode?

see if that helps..

Posted on Sep 23, 2008

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