Hi, Can anyone help me? My Macbook Air has this issue of the screen occasionally turning dark with a band on black bar running vertically down the screen. It may take a few minutes to automatically change back to the normal screen. Sometimes, it just changes from normal to dark to normal for many times, before it stabilises to normal again. As I work very heavily on my laptop, it will be a hassle for me to send to a repair centre to fix out, unless they can do it on the spot.