Unhappy Samsung GT-I9001 screen problem

Hi!I am having serious problems with my samsung galaxy s plus!I purchased the phone from a friend and 2 days later the problems started!The screen is flickering and it has horizontal grey lines!Sometimes,when I wake up and I unlock the phone it has this problem but they disappear after a couple of minutes!Since yesterday I couldnt use the phone because I cant see anything on the screen!I attached 2 pictures!sorry for my english...
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