Purple and Green screen

My macbook pro (2012) screen has turned green and purple creating a weird glair. I have shut down multiple times checked display settings inverted colours are not on . If i go onto a website with a black background you can see the apple logo . i have switched backgrounds from bright to dark and nothing has changed . Certain corners of the macbook are black but if i put a folder on them it would still appear and its slowly getting worse . I believe it is water clogged and has fried the display , i am writing this to see if i can fix it at home through settings or i have to go to the apple store.