Macbook pro to HDTV - Detects tv but can't arrange screen

Oct 7, 2011
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I am trying to connect my macbook pro to my hdtv, but when I do I can't arrange the screen properly, so I can view it on my tv.

On the "display" window on "system preferences". Then on the arrangement tab, there are 2 blue boxes, which I presume represent the 2 screens. The trouble is I can't place one on top of the other, which I think I need to do in order to arrange them properly.

Am I doing something wrong? Thanks.

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