The Retina MacBook laptop is definitely a head-turner, sparking some controversy around some of Apple’s choices for its boldest notebook design yet. However, it appears that some of the 12-inch MacBook units already purchased have an unexpected Setup Assistant flaw that has nothing to do with regular Retina Macbook complaints. The error makes it look like the laptop lags all of a sudden and fails to respond.
It seems that this issue is serious enough that Apple has created a special help page on its support site to address it.
Apple already has a fix for your ‘broken’ Retina MacBook