Hi everyone who may be reading this, I need to pick your brains as I am all out of ideas and have tried everything. I purchased an IMac second hand 2011 model, got it serviced and had a new fan replaced. I installed new user and High Sierra and everything thing seemed to be going well...UNTIL...after the few times of rebooting it would then get stuck on what I have since learnt the 'screen of death'. It's a white background with grey apple logo and a loading bar that makes it way to about half way before doing nothing else. I have tried everything on the internet and cleaned installed a few times, but the problem persists. It will load in Safe Mode fine and I tried to isolate the login items but nothing appeared in Safe Mode so I removed Googled Chrome and Pages (I'm a student so only really use it for that). I've read a lot of forums where other users have had issues with High Sierra and I do not know how to downgrade to os x el capitan. I have a Macbook Air 2015 (brand new) that runs High Sierra and never had any issues what so ever. Can someone please shed some light as I'm ready to throw it out the window!