![]() I don't know what " Reason: Mac-F2268AC8" means, but the other message clearly means the mid-2009 MacBook Pro is not supported by macOS High Sierra.īy coincidence I had watched a video yesterday concerning the īooting that way showed the above screen, telling me " This version of Mac OS X is not supported on this platform!" None of that resetting made any changes - the macOS High Sierra installer still failed to start in a strange way.Īfter some additional searching I found a suggestion to boot by using Command+S. A complete reset is performed by unplugging the battery pack, the power supply, and then holding down the power button for awhile, presumably to drain off any held energy in capacitors. Initially the suggestions I found said to reset the NVRAM, the PRAM or the SMC, and even to do a complete reset of the computer. The Apple support knowledge base, the Prohibitory Symbol is shown when "your Mac couldn't find a valid System Folder to start up from." This didn't make sense since the installer USB drive does have a System folder. Instead - the computer showed a grey screen with this symbol: Normally booting off the installer this way launches the installation program, and we would then proceed with the installation. ![]() The initial behavior was - insert the USB drive holding the macOS Installer in the USB port, reboot the computer, hold down the Option key, and select the installer drive. Getting to see that message took some digging.
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