When on skype earlier today, my macbook pro froze and the image on the screen was distorted and pixelated. Then the screen went black and it started beeping. Now I can't turn my macbook pro on. When I try to, my mac just beeps and the power light blinks. I turned it off and let it sit for a couple of hours, and when I try to turn it back on, it won't. It still just beeps and blinks. Does anyone have any idea what this could be caused by? Is it a virus? What should my next step be? Thanks for your time!