My company uses Dell laptops exclusively and I have never had trouble connecting a projector to a laptop and duplicating the laptop screen on the projector.  Now we are updating to large LED HDTV's in our conference rooms and I am trying to get the laptop screen to duplicate on the HDTV using the HDMI connection on both laptop and TV.  I can get it to Extend the desktop to both screens, but, not duplicate them.  The option is not under the Windows Change resolution dialog box or the Nvidia Control panel.  The only options are Display only on 1, Display only on 2 and extend desktop.  I have tried the updated Dell supplied Nvidia and Intel drivers and even gone to the Nvidia website and downloaded their latest.  What the heck am I doing wrong?  Any ideas would be appreciated.