Then the computer will boot into Mountain Lion normally and both monitors display properly. The only way I can see anything in Mountain Lion is to remove the Sapphire RX580 video card and install the old ATI Radeon video card. However, NOTHING appeared on the monitors (dual monitors). I heard the musical chord that plays when a MAC boots. I think the computer booted, but I'm not sure. I tried setting the start-up drive to the old OS (Mountain Lion). When I am running Mojave, I see them both. It is a single 480 GB SSD, partitioned into two drives.
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