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Dual Monitors not working - "NO SIGNAL"

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I appreciate any advise that may come my way.

I am running Windows XP on a desktop. I recently bought an LCD TV and wanted to setup dual monitors.

My video card has on VGA slot and one DVI slot. As a result, I have one VGA cable connecting the initial monitor to my PC. I bough a DVI/HDMI cable and used that to connect my television to the computer.

When I go into Display Settings, Windows shows me a 2nd monitor and allows me to extend my desktop.

The ISSUE: the LCD TV ( 2nd monitor ) continues to say "NO SIGNAL" so that while i have the option to drag windows onto the 2nd monitor, they will not display.

I assume in this situation, the cable works fine since the connection is picked up, the video card is fine since it shows a 2nd monitor and has 2 slots...what can be the issue?

Please help.
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