Macbook started up with black and green screen

So I started my macbook and at startup it was black for a while - which happened before. So I rebooted it a few times with control+option+shift+power which didn't work for the first few tries. 2 times the screen was black and after I pressed the reset buttons it was green for a second and the third time it was bright green but it worked afterwards. Question is, even though I've started it up, is there something wrong with it? Should I get it checked out or something? Pretty sure it wasn't green last time.