I have a 2011 Macbook Air that has been working great since i have had it. A couple days ago it began something unusual that i cannot figure out or find anyone that has experienced the same thing. When i open the computer, it will come on like normal then suddenly the screen majorly distorts (looks like small lines of pixels shift randomly up or down completely distorting the image but i can still tell the image is supposed to be my blue background). After no more than 1 second the image returns to normal and I have no trouble out of it while I am using it. I would not be worried if it was only once, but it has done this the past 3 or 4 times I opened it, but it always goes immediately back to normal and has never given me problems while working. Any suggestions on causes, potential fixes or possible further issues are welcome. Before anyone asks, I have not upgraded anything on the computer and have not recently downloaded any software. I also have not messed with any screen resolution settings (or any other settings) since i set them when i bought the machine.