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Apple Computing Products:
macOS - Operating System
Boot Choices - Mojave or Mountain Lion
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<blockquote data-quote="krs" data-source="post: 1878666" data-attributes="member: 67742"><p>I don't see how your Mojave upgrade or video card replacement could have anything to do with your problem. I use a 2012 Mini and have no trouble booting up in Mojave or El Capitan via the option key.</p><p></p><p>I assume you can boot up in Mojave but the other macOS (you didn't say which one...ooops - it's in the title) doesn't show when you hold down the option key.</p><p>Check disk utility to see if both hard drives show - if they don't then check the hard drive and cables in the Mac Pro. Maybe something got disconnected when you installed the video card or one drive is dead.</p></blockquote><p></p>
[QUOTE="krs, post: 1878666, member: 67742"] I don't see how your Mojave upgrade or video card replacement could have anything to do with your problem. I use a 2012 Mini and have no trouble booting up in Mojave or El Capitan via the option key. I assume you can boot up in Mojave but the other macOS (you didn't say which one...ooops - it's in the title) doesn't show when you hold down the option key. Check disk utility to see if both hard drives show - if they don't then check the hard drive and cables in the Mac Pro. Maybe something got disconnected when you installed the video card or one drive is dead. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Boot Choices - Mojave or Mountain Lion
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