I have a 2010 MacBook Pro 15" (2.66 i7, 8GB). She's been pretty good to me getting me through college and all. But I've never been easy on it and though on paper it seems to still be a powerful machine, it struggles with some more basic stuff these days. About a year ago it started doing these weird graphic artifact things and its gotten to the point where they happen constantly. Scrolling, rolling over interactive web stuff, etc. Seems to always be with web browsing though, both in Safari and Chrome. Anybody else get this? Is my logic board cooking itself?