Hey all. I have a Mid 2010 MacBook and I, too, am having the same exact issue after the last High Sierra update. I’m thinking it might have been a corrupt file or something to have erased several ppl’s hard drives. I’m absolutely positive that no liquid has ever come in contact with it. I have been without a computer for the past month and I work from home with my MacBook as my only way of accessing my control panel so I can get a paycheck. Smart phones aren’t allowed