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Windows 7: Radeon HD 6670 Dual Monitor setup not detecting 2nd monitor


31 Jan 2012   #1

Windows 7 Home Premium x64
 
 
Radeon HD 6670 Dual Monitor setup not detecting 2nd monitor

I am having troubles getting my dual monitors back.
Initially had a GeForce 8400GS 512MB PCI video card and was using the on board video (Biostar G41 M7 MB) for dual VGA monitor setup.

I've installed a Radeon HD 6670 1GB PCI-E video card with monitor one setup via DVI to VGA adapter on output one and 2nd monitor on VGA onboard video.
I cannot get the second monitor to detect in any configuration. Tried looking in BIOS of MB, using 2nd DVI (w/ vga adapter) on Radeon card.

Am at a loss and I hope I have provided enough information for some assistance.

Much appreciated

Weeg


My System SpecsSystem Spec
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31 Jan 2012   #2

Windows 7 Pro x64 (1), Win7 Pro X64 / WinXP Pro x86 on (2)
 
 

Quote   Quote: Originally Posted by Weeg View Post
I am having troubles getting my dual monitors back.
Initially had a GeForce 8400GS 512MB PCI video card and was using the on board video (Biostar G41 M7 MB) for dual VGA monitor setup.

I've installed a Radeon HD 6670 1GB PCI-E video card with monitor one setup via DVI to VGA adapter on output one and 2nd monitor on VGA onboard video.
I cannot get the second monitor to detect in any configuration. Tried looking in BIOS of MB, using 2nd DVI (w/ vga adapter) on Radeon card.
I don't understand why you are using a combination of DVI (to VGA) out of your HD6670 to one monitor, and also using the VGA out of your motherboard to the other monitor.

Am I interpreting what you've done correctly? You are using just the DVI output from your HD6670 through a DVI-to-VGA adapter and on to your first monitor, and also using the VGA output from the onboard graphics of the motherboard to feed the second monitor? If so, this is very wrong.

Your new HD6670 has TWO video outputs of its own: one is DVI, and the other is VGA. You should connect your second analog monitor to the VGA output of the HD6670, not to the onboard graphics VGA output.

Also, if you can disable the onboard graphics in the BIOS that's definitely what you should do when you install an external video card as you've done. At the very least you should give priority to the new PCIe video over PCI (which was your old GeForce card, and probably onboard graphics chip as well?), although "AUTO" might be just as acceptable. I'd still disable onboard graphics if I could.

You might have been using a combination of the old GeForce video card and onboard graphics before (did that GeForce card only have a single output?), but the new HD6670 has dual-output of its own, and that's how you should connect your two monitors... to the two outputs of the HD6670. I suspect that while your old dual-monitor setup was kind of a kluge of PCI-GeForce and PCI-onboard graphics and worked fine, the new setup involving the PCIe 2.1 HD6670 is a different beast entirely. Probably the onboard graphics output is being suppressed by the BIOS in light of the PCIe graphics card, but who knows.

Anyway the correct setup for you is to use the dual video outputs of your HD6670 to support your dual monitors. You should NOT be using onboard graphics at all, and if possible it should be disabled in the BIOS settings of your motherboard.

The ATI Catalyst drivers that manage your HD6670 are prepared to support your two monitors directly connected to the two video outputs on the HD6670 itself. The DVI->VGA adapter to one monitor, and VGA to the second monitor... this is a standard setup.

Have you installed or upgraded to the latest Catalyst drivers from the ATI/AMD support site? This is a good idea.
My System SpecsSystem Spec
01 Feb 2012   #3

Windows 7 Home Premium x64
 
 

My video card has 2 DVI outputs and no VGA

Thank you very much for your help. my second DVI is SL-DVI-D (digital) and will not allow for DVI to VGA conversion ( JUST read this in a pamphlet card that I missed reading)

So alas, this card will not allow me to have 2 vga monitors for dual screen.. good excuse to go and buy a new monitor hahaha.. now to convince the wife

Cheerio
My System SpecsSystem Spec
.


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 Radeon HD 6670 Dual Monitor setup not detecting 2nd monitor




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