Dual monitor video cards have two main settings - clone and dualview. Your ststem (video card setting) sounds like it is in the CLONE mode. In this mode you will have the option (in your video card menu) to select the primary monitor. When you select the TV as the primary monitor the video will play on your tv or if you select the other monitor as the PRIMARY MONITOR it will play on this monitor. Most programs will operate on both monitors in this clone mode but the video on the NON primary monitor will be a black box.
I use the clone setting and just switch back and forth between the 3 monitors (hdtv-screen-computer monitor) depending upon what I am doing or watching.
The dualview setting allows you to have the image on both monitors at the same time. You must have inadvertantly changed these settings.
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