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I have an emachines Windows7 PC. I am trying to run the on board video card along with the dual DVI card I installed in the PCIE slot. In CMOS it shows the on board card as disabled and it will not let me enable it? Its greyed out so I cant even highlight it to change anything.

I have done this before in XP on a few different machines so I know its possible, Any idea?

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This is not a XP vs. Windows Vista or 7 issue... what you are describing is a motherboard issue.

I would check for an updated BIOS, but in many cases you don't have a choice whether onboard video is disabled or not when installing an add-in graphics card. Sometimes, manufacturers make this decision to reduce confusion (there are many people who install a graphics card and then plug their monitor into the onboard VGA/DVI socket). Or the motherboard design will turnoff the internal graphics and re-route the PCI-E lanes from the onboard chip to the graphics card you installed.

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Dustin is correct. This is a function of the mainboard (and not an advertised one, either), not the OS. Some chipsets support this ability, most do not. And BIOS updates do not usually change this support. – music2myear Oct 18 '11 at 21:01

Vista and W7 are not as friendly towards multiple video cards as XP was

If you have two different video cards that have different WDDM Drivers – one will be disabled

No work around that I know of.

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