Guest Nightwatch45 Posted December 6, 2021 Posted December 6, 2021 Have Mac Pro 5,1 that I’m having problems booting. It loads is to about 3/4 on progress bar and stalls. Have recently installed open core legacy patcher to run big sur and does the same using open core boot picker. Ok this is what I’ve tried so far Reset pram, changed battery on main board, ran Apple diagnostics hardware test - only thing that boots - ok with three passes on extended. Checked drives on another Mac - all report ok. Tried to boot from usb mojave installer boot disc (... Read more Source: MacRumors
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