Guest jfreberg Posted November 14, 2021 Posted November 14, 2021 My MacPro 5,1 (flashed from 4,1) is having trouble booting when there is a second drive connected that has OpenCore installed. My primary boot drive is a PCI NVME SSD, and boots reliably with 2 other SATA drives in the system. I cloned the NVME SSD to a third drive as a safety backup. When that backup drive is installed, the system hangs on booting and never gets to the boot picker screen. Removing the cloned drive allows the system to reboot normallly. I suspect there is some kind... Read more Source: MacRumors
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