My Macbook screen tends to flicker when turned on or coming out of sleep. It acts like I'm pressing F1, F2, F1, F2, etc. quickly. Anyone else have this problem? I took it to the Apple store, but the genius couldn't set off the flicker and, therefore, couldn't do anything about it. Should I attempt the Apple Store again (which is a 30-40 minute drive one-way), or try AppleCare instead?