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Christian de BellefeuilleFlag for Canada

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Dual Monitor on Dual Graphic Cards, doesn't detect 2nd monitor

I've a friend who got 2 Graphic Cards linked together (SLI), and for some reason Windows 7 doesn't detect his 2nd monitor.

Each graphic cards got 2 DVI, 1 HDMI, 1 DisplayPort.
There's a VGA port onboard but it's disabled.

Both monitor he got are quite old and got only VGA so he is using a VGA->DVI converter.

I've tried both monitor, alone, and they both work and their converter too.  

But the only port that is showing up in Windows is DVI PORT #1 ON VIDEO CARD #1.

Anyone can help with this problem?  Is there any setting in Catalyst that i should do to let Windows 7 detect both monitors?

I've tried all theses combinations, but none seems to allow Windows 7 to detect his 2nd monitor:
Mon1 on Card1.DVI1 + Mon2 on Card1.DVI2
Mon1 on Card1.DVI1 + Mon2 on Card2.DVI1
Mon1 on Card1.DVI1 + Mon2 on Card2.DVI2

Thanks for your help
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Perarduaadastra
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There seems to be some confusion here - you say that your friend's computer has two graphics card linked with SLI, which is nVidia, and then you refer to the use of Catalyst, which is Radeon (formerly ATI, now AMD). It can't be both, so which vendor's products are being used?
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Gary Case
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@Perarduaasomething: I don't know the correct term for that, but he got Catalyst on his computer, that's for sure.  I said SLI because i thought it was named like this.  Both cards are linked together by a thin cable between them.  The connector is on top of each card.  It's approx 1 inch long.

@garycase: thanks a lot for those info.
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I've just tested it (deactivated CrossFireX) and it successfuly detected the 2nd monitor.
Thanks!

I've advised him about that little particularity of having 1 monitor per port type if he want to reactivate it.