I updated my early 2013 rMBP yesterday to 10.10.3. Noticed that when I startup the Mac, the screen will be black for about 30 seconds and then show the logo, then to the login screen. Before the update, once I power on, it will show the logo right away, then to the login screen. With the black screen that shows now, it makes me think that there is something wrong with the Mac and I freak out a little. Does anyone have a similar issue?