Hey everyone, my brother has been having some trouble with his 2013 baseline 13inch MBA. The main issues he's had is that his screen will go black and the computer will freeze, only a hard reset will restore. It should be noted that this a rare occurrence. It happened tonight while watching Netflix, strangely enough the audio kept playing while the screen was black. I ran a hardware test, and the only issue found was that it wasn't plugged in. Also he's on the latest version of OS X, and did not have a bad SSD (never received the update). I did notice some strange graphic artifacts while in the hardware test, clicking the apple support links. My gut says its a graphics issue and logic board needs to be replaced, but the hardware test did not come up with anything. Are there anymore tests or anything I should do, before we resort to booking a genius appointment? Thanks everyone!