Dual Monitor problem with windows 7

sabres2332

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5
Have a Dell OptiPlex GX520 running A06 BIOS, just upgraded from XP to 7. I no longer can get the dual screen to work with the dual monitor video card. Tried changing the video setting from auto in the BIOS. The onboard VGA works, however when I attempt to use DVI/VGA Dual card screen black out and go to stand by mode. Driver is up to date. Any suggestions?
 
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