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I have an ATI XFX Radeon 4670 1GB video card in a Windows 7 Ultimate x64 setup. If I only use one monitor, all is well. If I plug in a second DVI cable to the card, both monitors go dark. I can get one or the other to display, but only when it is the only one plugged into the card. I'm really hoping for a dual-monitor setup here as that was the point of the card. I'm using ATI Radeon HD 4600 Series video drivers dated 11/24/09 (8.681.0.0) which are the latest from their site and are supposed to work with Vista or Windows 7 x64.

When the computer boots with both displays connected, both monitors display the inital BIOS and boot screens. The Windows 7 splash screen also displays, but by the time it goes to the login screen, one monitor is offline.

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closed as too localized by nhinkle Aug 5 '11 at 6:24

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Oh, and trying to reinstall either the 9.12 or 9.11 drivers results in the CATALYST Install Manager crashing: Problem signature: Problem Event Name: APPCRASH Application Name: InstallManagerApp.exe Application Version: 3.0.750.0 Application Timestamp: 4af194f1 Fault Module Name: MFC80U.DLL Fault Module Version: 8.0.50727.1833 Fault Module Timestamp: 482bb4a2 –  ssmith Jan 5 '10 at 20:28
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2 Answers

When the computer boots with both displays connected, both monitors display the inital bios and boot screens.

sound pretty much like a driver problem alright, try an older driver.

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Thanks! I grabbed 9.11 from the link you provided but it crashes when I try to run it. –  ssmith Jan 5 '10 at 20:29
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Right click on your desktop, click on "Screen Resolution."

You should see both monitors there, and a drop down list box labelled "Multiple Displays"...you should select something that makes sense for whatever setup you want, such as "Extend."

If you don't see both monitors there, there's a high chance that Molly7244's driver issue is in play.

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Also there's a pretty good chance that you're using ATI and not nVidia. Oh snap! –  ta.speot.is Aug 5 '11 at 5:54
    
Erm... the user asking this question hasn't been seen in over a year, and drivers have changed substantially since then. Not really worth answering at this point. –  nhinkle Aug 5 '11 at 6:23
    
Oh snap, didn't even notice. –  DavidChenware Aug 5 '11 at 7:17
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