LG Optimus F6 screen completely blank/black. Phone still receives calls/notifications.

[AC Question]

Just happened out of the blue. No water damage. Nothing I can pinpoint to have caused it. When I push the power button, the lights on the home button turn on, followed by the phone vibrating due to the notifications it has. Even called it with a relatives phone. Call went through but it just vibrates and doesn't let me answer the call since the screen is dead. How do I fix this?