I've attached my Mac Pro's HD3870 to my 37" Sharp 1080p TV. I've made my TV the primary display at 1920 x 1080 (the res of the TV) but the output from the graphics card appears to be cropped. The Apple menu and about 1/3rd of the dock are missing. There are also black bars at the side of the TV. I know for PC you can use NVIDIA tools - but what can we use? Why is this happening?