There is a thin VGA ribbon cable that runs from the mother board to the display, through one of the hinges. Sounds like you have a loose connection at one end of this cable, or the cable itself has an issue. I am only speculating really, but it sounds like this could be the case. I would start by re-securing both ends of the cable to see if this makes a difference. Google is your friend for tear down pictures and instructions.
P.S. I have a Samsung netbook too and I love it!
Edit: See this link, and other links on the thread: http://www.sammynetbook.com/plugins/...opic.php?49020