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I have this motherboard in my machine.

I have installed an NVIDIA GeForce 8400 GS in the PCI-e x16 slot.

I have two monitors connected to the GeForce, and they work perfectly. I have connected a third monitor to the onboard display adapter, but the third monitor doesn't function at all. Windows Device Manager doesn't detect the onboard display adapter, pointing to the motherboard/BIOS disabling the onboard display adapter while an additional display adapter is installed in the PCI-e slot.

Is it possible to get around this issue, by customizing the BIOS configuration or installing a third-party BIOS image?

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Does your machine/motherboard support adapter switching? I use a Lenovo T400 that comes with that feature, as does my Macbook Pro.I don't think it's something you can customize on your own. –  Traveling Tech Guy Jul 7 '11 at 19:31
    
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Generally speaking once a PCI-E adapter is detected, the on-board graphics are disabled. As this motherboard is generally integrated into HP systems, I can't see the BIOS offering this functionality as HP tend to pare down the available options to the bare essentials.

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This has also been my experience. I think there's no strict architectural requirement for this, though they may build motherboards this way, you could find a board that'll let you use both. BIOS settings would be where you'd have to search for an option to that end. –  Doc Jul 7 '11 at 19:49
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I had an issue the same i went into the bios and turned the onboard on, it worked fine just connected the 3rd monitor.

If you don't have the option in your bios i really don't think you can do it.

Your options are buy an amd card that has either duel dvi or one with a display port you can't do 3 monitors with 1 nvida card or buy a motherboard that lets u use the onboard and pci ones with intel hd graphics let you do this.

what ever is cheapest if your short on cash if not just get a 6970 i have one and its awesome u can run 5 screens with simply plug and play.

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What motherboard did you have? This is probably relevant. –  ijw Sep 1 '12 at 13:52
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