After I start up my Inspiron 15R and log in to either Windows or Ubuntu, the screen starts flashing white, blue, green, yellow, etc... until it eventually shuts off on its own. When this starts happening, the three (what looks like to be monitor?) buttons at the top of the keyboard glow in and out once, then go back off. What is happening? It's not software, because it's happening on both OS's. What is the issue?