Dell Inspiron 15R 5537 Screen/Graphics Problems

Sorry if I have managed to post this in the wrong area; first time in the forums. I have an Inspiron 15R 5537 that I purchased around Christmas time I believe. It has worked perfectly until about three weeks ago. I set my laptop down on a bed and came back within a few minutes to find my screen looked very different then when I left it. The screen had become very pixelated and the colors were highly saturated. It seemed like the contrast had been completely turned up on my screen, and yet when I checked the graphic settings, everything is at the default settings. No, water was not spilled. The heat in the room was a normal 60 degrees in my house. I have no other ideas on how to resolve the issue. Please, any ideas are welcome.