Whenever I move over a Flash video with my mouse the screen flashes checker patterns and it flashes black. Can you watch the video and tell me what you think? http://www.youtube.com/watch?v=ib0-W_AY3nw Also, sometimes my screen will randomly flash black bars and the mouse will move, but not affect anything. Edit 8/9:Okay, I was on the phone with the AppleCare reps for around 3 hours, and they told me to take it to the Genius' Bar to get the logic-board replaced. Do I need to back up my data before I go? Any thing else that I should do?