Guest Mac.Apex Posted November 27, 2023 Posted November 27, 2023 After successfully installing Windows 10 from DVD via Boot Camp on a Mac Pro 5,1, I tried to go back to the High Sierra partition, but the option key would not bring up the Startup Manager, and it booted directly into Windows. When I tried to change the startup disk in the Boot Camp Control Panel, I got the following message: "An error occurred while trying to change the startup disk. You may have not have privileges to change the startup disk. Make sure you have administrative privileges... Read more Source: MacRumors
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