Okay I'm really pissed off as ***** right now. Basically my MBA has been blacking out randomly ever since I got it in Nov 2013. About 5 months later it started to shut down randomly. 1st repair: Motherboard was replaced, issue persisted. 2nd repair: No issue found according to QCD (Apple authorized repair centre), issue persisted. 3rd repair: QCD said my VMWare was causing the problem, however I reformatted the drive and the issue still persisted. 4th repair: QCD did a clean reinstall and replaced the motherboard again. Computer no longer shuts down randomly but now it's doing the blacking out thing again. I'm planning to either bring it back to the store tomorrow or call Apple up and demand that they replace the laptop. Which one should I be doing first? Also, what are the chances that I'll succeed in getting them to replace it for me?