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Dual Monitor for Dell Optiflex 780

knev

Member
I own Optiplex 780 machine with win7 and have connected dual monitor.
I can see the display mirror on both screens.

Enabled for Extended option, pressing windows button +P shows the option but changes does not happen.

On screen resolution, i cannot see the extended option.

Please suggest how to set this up?

Thanks
knev
 
I was able to figure out the problem, in display option, there it does not shown two monitors. The problem with the dongle
 
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