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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Unable to get to the boot switcher menu

I am holding the option key as I should, but the boot switcher will not show up. It just boots to the OS currently installed.

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Hi

You will need the following

Apple Mac flashed metal supported graphics card

And a wired apple/Mac keyboard

Hopefully this answers your question

Thanks

:)

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