2.7GHz Quad-core Intel Core i7 16GB 1600MHz DDR3L SDRAM 512GB Flash Storage My rMBP is freezing up during startup...I have tried booting up to recovery mode and safe mode and neither work. I either get the message "Your mac has restarted because of a problem" or it just freezes while loading. What else is weird, is that two of the lines on the loading wheel are pink and green..no idea what that is. I had this problem earlier and and was able to erase my drive and reinstall thru recovery mode, backed up on an external drive using time machine. Any Ideas?