dual display problem

i've been trying to get a dual display working for my computer but cant. have a 19" monitor, and want to use my tv as a second monitor. an svideo to rgb adapter came with my nvidia 9800gt video card and so i picked up some rgb component cables to run to the tv. first tried to set up dual screen, didnt work. any time i try to set up dual screen, primary monitor display settings get screwed up and it says it cant save the settings. i can only set the monitor on ``show desktop only on 1`` settings. can unplug the monitor and use tv as primary screen, and can boot up in safe mode, but fails during regular boot at log in screen and goes blank. any ideas

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