Hi there, I got my 16gb/2.3/256 rMBP earlier this week and installed mountain lion on it. I enjoyed it very much so far but then when i wanted to start it today, after loging in to my account it only showed a grey/black screen... I restarted, logged in and everything worked fine. I tried it again, logged in, got the grey screen, restarted, everything worked fine, restarted, got the grey screen, restarted, and so on What is happening? Thanks for your help!