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Switching HDTV input then back, no desktop visible

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Connecting the Windows computer to an HDTV requires it to boot while connected to display anything--once in Windows, if I connect to the HDTV it won't display a thing. Now, I need to switch the HDTV to other inputs then back to the computer while the computer is on. And it won't work... what happens is that when I switch back to the computer (GeForce 8800 Ultra DVI->HDMI adapter->HDTV) it's a blank screen, and I have to restart the computer! Please help! I have to give a presentation soon and this has to be working.

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