I have a 2008 Mac Pro that I bought w/o a hard drive. I have a hard drive to install, but can't figure out how to get it up and running since the hard drive doesn't have OS X on it... I created a bootable version of Sierra on an external drive and tried to boot from that drive, but just got an error and the machine shut off. What can I do?
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Someone may come up with a better solution than this, but I've never found one in 9 years of owning an 08 Mac Pro...
Though, first of all, it cannot run Sierra, so you'll need El Capitan or older.
Your choices are:-
Get a boot image onto a spare hard drive in the same way you got it onto a USB stick & boot from that.
Get a bootable CD/DVD of Lion & work from there.
or I suppose a late 3
- Take it to an Apple Store & they'll do it for you.
I have never been able to get an 08 to boot from a USB stick, no matter what I've tried. The 09's will, but not the 08's.
It's also too old to boot to Internet Recovery.

Tetsujin
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Is the '08 too old for Internet Recovery because the image is no longer supported at Apple or because the feature never existed? – bjb Nov 21 '17 at 18:17
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1Oops - way late to see this, but the feature simply never existed until about 2011. Some cusp machines will boot to it if they've had a firmware update, but nothing this old. – Tetsujin Mar 27 '20 at 12:29