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problem with laptop screen?

my laptop screen is always flashing and sometimes goes really dull, to the point at which i cannot see the screen. i have to partly open and close the laptop until it stops and then a few seconds or minutes later it starts flashing rapidly again. i have sent it off to be repaired and it worked fine for a short while. what do you think the problem could be and how can i fix it?
ashley w, December 2010