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Question: Early 2009 Mac Pro install sierra and high sierra issue

Early 2009 Mac Pro 2.66Ghz Quad-Core Xeon 14GB Ram, upgraded to firmware 5.1.


While installing sierra (plan to upgrade to high sierra afterwards), the mac restarted by sierra installer but went back to Mountain Lion like nothing happened.


Please advise...

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Answer:
Answer:

Here is the rough timetable:


Start download from Mac app store. This takes 20 minutes to an hour.

Once complete, start Installer. You specify disk on which to Install.

Install checks things out and then copies MacOS Base system to the destination drive. Time 20 minutes to as much as 3/4 hour if your drive is slow. (if installing on the same drive as the download, this step becomes trivial, and does not take any time).


Installer sets startup to the new MacOS Base System and does a Restart.

>> a failure right here means you still have everything on your old drive, (plus about 6GB of MacOS Base system that does not work)

ONLY if Restart was successful do you begin replacing files to move to the new version of macOS. Time 30 minutes to 3/4 hour.

Restart again and comes up running the new version, in Setup Assistant.

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Feb 28, 2018 9:54 AM in response to markeels In response to markeels

Sierra to High Sierra on the Mac Pro 4,1 updated to 5,1 requires a firmware update. To run the firmware update requires a graphics card with genuine Apple firmware.


Once updated, it still seems completely backward-compatible. We have not seen any reports of functions lost, including booting from the 10.6 DVD.

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Feb 27, 2018 2:03 PM in response to markeels In response to markeels

Here is the rough timetable:


Start download from Mac app store. This takes 20 minutes to an hour.

Once complete, start Installer. You specify disk on which to Install.

Install checks things out and then copies MacOS Base system to the destination drive. Time 20 minutes to as much as 3/4 hour if your drive is slow. (if installing on the same drive as the download, this step becomes trivial, and does not take any time).


Installer sets startup to the new MacOS Base System and does a Restart.

>> a failure right here means you still have everything on your old drive, (plus about 6GB of MacOS Base system that does not work)

ONLY if Restart was successful do you begin replacing files to move to the new version of macOS. Time 30 minutes to 3/4 hour.

Restart again and comes up running the new version, in Setup Assistant.

Feb 27, 2018 2:03 PM

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Feb 27, 2018 2:08 PM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

Thank you for the answer! It helped me with a clear vision of the process. I managed to install the new os on a different drive with a couple of manual restarts once it got stuck. And I am in the setup assistant phase now. Hope everything goes smoothly from now on.

Feb 27, 2018 2:08 PM

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Feb 28, 2018 9:54 AM in response to markeels In response to markeels

Sierra to High Sierra on the Mac Pro 4,1 updated to 5,1 requires a firmware update. To run the firmware update requires a graphics card with genuine Apple firmware.


Once updated, it still seems completely backward-compatible. We have not seen any reports of functions lost, including booting from the 10.6 DVD.

Feb 28, 2018 9:54 AM

Reply Helpful (1)
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Question: Early 2009 Mac Pro install sierra and high sierra issue