My laptop Hp Pavillion has been having display problem for any days.When I start the pc full screen turns white slowly.But when I press thee upper left side of the screen there are some strange marks on the screen and it becomes fine again.But sometimes it doesn't and sometimes the screen turns white suddenly.Do any of you have this problem?What can be done?

---------- Post added at 21:32 ---------- Previous post was at 11:53 ----------

Hey why isn't anyone replying.If you don't have the solution at least give me some clue.