Hi everyone, With all you geniuses here maybe someone will have the solution to this. I installed El Capitan yesterday on both my 2012 RMBP and 5k imac. Both seem to install fine and boot up normally. But when I do a restart, both computers get stuck at the black screen with Apple logo. The progress bar remains empty and doesn't move for hours. I tried rebooting with cmd-R but nothing helps apart from reinstalling El Capitan. Then the same thing happens. I can sleep the computer and it wakes up fine. On the first install, it mentioned something about Little Snitch not being compatible but that has already been updated. Restart and it gets stuck in the same place. Please help!