Since yesterday, my screen has been acting really wierd. Every few hours, the screen goes all fuzzy with a bunch of white lines on it, and it becomes completely unusable. It only happens for a few seconds each time (fortunately, it's fine right now), but it's kinda got me worried because I need to keep this computer for 2 more years before getting a new one, and I can't afford to fix it. I can't stop using it because I need it for school, so if it breaks, I'm completely screwed. Anyone have an idea of what's going on?