apple mac flashing question mark : We have not many iMacs of 2017 model running on Mac os Mojave (10.14.2). In the wake of redesigning OS from High Sierra (10.13.6) to macOS Mojave (10.14.2) machines began restarting with flashing folder with question mark icon and the issue settle briefly with a PRAM reset, again after at some point the machine restarts with a glimmering organizer and we can't get the main driver why this issue happens. mac flashing folder with question mark We attempted different things by re-introducing the macOS , overhauling OS to 10.14.4 , utilizing combo update to 10.14.4 , putting imacs in logout mode e.t.c., however none of them works. We ran equipment tests and discovered that issue isn't with the equipment.