Output to TV only works if monitor is plugged in

Question

I am trying to use my TV as the sole output for a computer. The computer has a graphics card with 2 outputs - one VGA and one DVI.

I have the VGA output going to the TV, and when the DVI output is connected to a monitor, display works fine on both the monitor and the TV.

If I turn off the monitor, or even turn off power to the monitor, the TV continues to display the desktop. If I unplug the DVI cable from the monitor (remember that the monitor doesn't have any power at this point), the TV stops presenting the desktop and displays a "Not Accepted" message.

When starting up the computer, the TV displays fine, but stops working at the "press ctrl-alt-delete" screen unless the monitor is connected.

How can I make the TV show the display without the monitor?

The TV is an LG RT-42PZ45V.
The graphics card is an ATI Radeon series HD4350 512MB GDDR2.
The computer is running Windows Server 2008 r2.

Answer 1

This may be a driver issue with the video card; the easiest thing to do if nobody knows a simple workaround is to wire a dummy plug to fool the graphics card into thinking there's a monitor attached to the DVI port.

This can be done by finding a DVI-VGA adapter and bridging the top three pins on the right with the pins directly below one-to-one, using 68 ohm resistors: