12/30/2023 0 Comments Impression that i get year![]() ![]() Right before I posted this, I was directed to another thread where said: My question is- Am I correct in my assessment, and is there anything I can do to fix it from the Windows 10 side? I am afraid somehow it has been corrupted/overwritten by the Windows 10 install or updates. I thought that there was no chance of a legacy install of Windows 10 affecting the firmware of the Mac Pro, but apparently that is not the case. If a drive only has Mac partitions, I get the following message: "No bootable device - insert boot disk and press any key." I tried booting up with other hard drives with multiple partitions on them, and only partitions with Windows 10 on them will boot on this Mac. Make sure you have administrative privileges and try again." The Command-Option-P-R combination is not recognized from the Apple keyboard nor from a PC keyboard, both connected directly to the Mac. You may have not have privileges to change the startup disk. 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. ![]() 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.
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