I'm guessing that blue screen you see when you connect with HDMI that it's just showing you the background. You actually have to move programs or icons to that second screen unless you select it to clone the displays, which will limit you to the lower resolution of the two screens. Quite a few people hook p a TV to the computer and think it's not working, the fact is that it IS working, you just need to actually move something to that screen so it shows you something more than the background color.