Your graphics mode is invalid. Likely either your resolution is to high or your refresh rate is to high or your color depth is to high. Connect to an old monitor and change the display to the correct settings and connect to the samsung tv. If you don't know the correct settings then check the manual.
On a side note, why did you buy an HDTV for a computer monitor? HDTVs are really only good for a computer monitor if you are using your computer exclusively as a mythtv box (or something similar) and want a large screen. HDTVs generally have very low resolutions compared to typical PC LCDS and cannot handle the higher refresh rates and bit depths.
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