Broken mac screen

Please can someone help

When I turn my Mac the screen isn’t black but it’s like blank - kind of dark blue as though it is on behind the screen but not showing a display 

After a while there are some lighter blue vertical lines and when I move the mouse is has a shadow like it is still tracking but the screen is blank

After a few minutes the screen came on for a moment, asked me to reset the password and went blank again when I click 

Does anyone know or have seen this before?