Dual Monitor for Dell Optiflex 780

[knev]

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

 

[gmaster456]

You may have to change that in your graphics driver software (i.e nvidia control panel and AMD catalyst)

 

[knev]

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