2017 27" 5k model 4.2GHz quad-core 7th-generation Intel Core i7, Turbo Boost up to 4.5GHz 8GB 2400MHz DDR4 2TB Fusion Drive Radeon Pro 580 with 8GB video memory For 2 days it seemed to work fine, although maybe there were a few signs that it wasn't working properly, such as app crashing and struggling to load icons in folder. I don't know, maybe I had unrealistic expectations about it working flawlessly since I'm coming from a 2010 iMac on its last legs. Anyway, I wake up today to the black screen with crossed out circle. Can't boot into Safe Mode, and when I go into Recovery Mode, this is what Disk Utility says after doing First Aid on SSD (it's a Fusion Drive but only SSD is listed under Internal..): First Aid found corruption that needs to be repaired. To repair the startup volume, run First Aid from Recovery. Okay, but am already in Recovery Mode.. .... Incomplete or inconsistent CoreStorage Physical Volume set Storage system check exit code is 1. Problems were found with the partition map which might prevent booting. Operation successful. What's the right course of action here? It's two(!) days old so would hate to fix it only to see more problems in the future. Am I in my rights to have it replaced with a new one? Or is this no big deal and easily fixed? Please help.