2010 Macbook Pro. preface: Running Mountain Lion, I know it's not perfect. That being said. 1. Since Lion (and problem occurs on Mountain Lion too), sometimes the screen will freak out and have this mess of random colored crap all over it. It disappears if I scroll the window that I'm in. It's like the graphics card screws up a calculation or something. 2. Since installing Mountain Lion, sometimes when I go to watch a flash video (YouTube), the whole computer just completely locks up. The flash part of the video goes blue/grey/black and then the mouse stops moving, and I have to do a cold restart. 3. Just this morning, my computer got all sluggish and weird. Like the FPS on the screen dropped to like 10 and the mouse was trailing behind my movements. Then the whole thing just shut off, and wouldn't turn back on. Even the battery indicator light didn't function. // When I got it to turn back on, the battery was at 50%. What the heck is going on? No AppleCare unfortunately, I've learned my lesson with that.