Hey all. I have NO clue what happened. I must have simply hit a button on the keyboard that I am unaware of, or something, but I need help. My air looked fine but the net was running a big sluggish, so just in case I went ahead and restarted my mac, when it came back up, the screen size (desktop) is quite a bit smaller, everything looks sort of squeezed tighter to fit, and there are large black areas on the left and right sides where the desktop used to fit the entire screen, now is not filling the screen. I have NO clue what I did... Can someone please help??