Q: Reinstall OSX on New Mac Pro

You need to have made it from a 10.9.2 installer to be able to do that.

(101945)

No retail version of OS X will boot that computer unless it is a later version than what came pre-installed.

You don't need 10.9.2 but you do need 10.9.1+ build that was used with the 6,1

T he other thing to consider doing is just make an image of the system for restore or to boot from for emergency or backup bootable system.

T he only reason would be if Migration/Setup Assistant somehow or you need to partition the drive and can't resize alone.

You can't do that; the only sources for the version of 10.9.1 that the computer requires are the recovery partition and through Apple's Internet recovery system.

(101947)

You would need to do a full Internet Recovery like so:

Install Mavericks, Lion/Mountain Lion Using Internet Recovery

Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.

Boot to the Internet Recovery HD:

Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.

Partition and Format the hard drive:

1. Select Disk Utility from the main menu and click on the Continue button.

2. After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.

3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.

Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.

Note: You will need an active Internet connection. I suggest using Ethernet

            if possible because it is three times faster than wireless.

This should restore the version of OS X originally pre-installed on the computer.

Press the Option, Command, and R keys at startup and see if you can reinstall 10.9.1. If that method installs 10.9.2, and you didn't make a backup of 10.9.1, there's no way to get it.

(101948)

I suggest that you consider cloning a bare, working system from the MP to a formatted 15 GB flash drive. Then you don't need to do an install. Just clone the basic system to the computer.

Once you've installed 10.9.1, use a program such as the Disk Utility, Carbon Copy Cloner, or SuperDuper to put a copy of it onto an external drive. You can then clone it back as many times as needed.

(101950)

Can you access another nMP to clone the OS? Once apple released 9.2, both App Store downloads and internet recovery will put you on 9,2 as well.