I have a new Dell studio laptop with external BD DVD player. I am trying to play a BD DVD movie on the laptop to a projector via the HDMI cord from the laptop to the projector. It works fine using the VGA port. Of course, the output is not HD. But the projector accepts HDMI input up to 720. So, I would like to play the movie using the HDMI. Unfortunately, the movie plays on the laptop, but I get an error message stating you are trying to use dual monitors and it will not play on the HDMI. Any ideas? thanks. Craig