Finder and Disk Utility not "seeing" 3rd hard drive...

I've rebooted multiple times and "command, option, p, r" ; tried putting my hard drive from slot 3 to slot 4 in mac pro, it is not being read.
J

What drive? make/model/size etc
Normally an unformatted drive will cause a dialogue on startup (eject, ignore, initialize)
Moving isn't going to help. 
Look inside to see the drive will slide in and you don't have any issue.
Then run Apple Hardware Test
More likely if anything is drive is DOA; logicboard; 'foreign' format that DU can't mount.
Putting in a FW case might be handy.

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