E7440 popping sound when powering off in The Archive Posted August 14, 2018 · Report reply I didn't try this solution directly but I did update to High Sierra (10.13.6). It looks like the bootpack has this method (layout id = 12) and this problem is gone. Thank you Jake! EDIT - sorry I spoke too fast. I still heard the sound after the most recent reboot. So it seems it's not happening every time but the problem is still there. Guess I will need to try out other layout ids?