Red/black graphic on inside of screen – Toshiba Satellite L505

Suddenly, this morning when I resumed my 2-yr. old laptop, there was a strange feather-like picture on the screen. It’s there whatever is running, and the pointer turns red when I place it under the red, so I assume it must be on the inside of the screen. I restarted– no help. It dosn’t look like anything I’ve ever seen on my computer–n o pictures, games, other software, so I have no idea what it is or why it’s there. Toshiba warranty is long gone, but the Squaretrade should still be in force. What should I do?