My macbook pro's screen turns black or blue?

so i got this 3 weeks ago .and it was perfect. a while ago .while i was using facebook .it turned blue .then later .i closed my laptop .when i opened it .the page was alright .then it turned blue then it faded to the original page .this happened thrice .the last time .it wasn't blue. it was black, :( and i never dropped this or anything,