You need to use a video card with a HDMI out to your TV. I had the same problem and it was the only way to fix it. Dell Optiplex to a Panisonic 50 plasma, finaly bought a cheapo video card, Nvidia 9600 with an HDMI out and ran that driectly to my TV and "BINGO!!!" all fixed. You will never get perfect resolution, like you would with a DVI or VGA in/out but this is 100x better than what I had.
The HDMI video protocol is the same as the DVI video protocol so swithing from a card with to DVI output and uses a DVI-HDMI adapter which just matches the video signal pin numbers between the two connectors to a card with an HDMI connector will not improve the digital video quality at all.
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