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iMac mid-2011 stuck at gray screen after 3/4 Apple logo with progress bar
I installed the High Sierra Supplemental Upgrade to my iMac mid-2011 with an AMD graphics card and a hybrid driver (HDD and SD). It seemed to be working well. But now my iMac mid-2011 gets stuck at a gray screen after the Apple logo is displayed and the progress bar is 3/4 done. It reboots again...