This is a 2011 Macbook 13" base model. Sometimes, quite frequently, my Air's screen will look like this in the log-in screen after waking it from full sleep. It looks like the image is scrambled. Once I log in, the screen's back to normal. When it happens, it happens across different areas of the screen each time. Has anyone else experienced this? Is this a sign of a failing screen to come? What is it? EDIT: I've owned it since August, and honestly have used it infrequently. It has sustained no damages (ie. drops, spills, anything...).