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Question: 2008 mac pro boots in 10.4 but not 10.10

I have two operating systems on a 2008 Mac Pro tower. The reason is that one OS uses on old scanner, and the other is 10.10 to do Photoshop work.

My computer will default to 10.4 now upon boot up.

Restarting with the option key will allow me to choose 10.10, but it usually hangs up on the gray screen before the finder launches. I am usually stuck there and I have to re-try.

If the finder launches, it takes forever to display the desktop and will often hang up on the desktop. I'm usually stuck with a spinning beach ball. I'll wait 20 min and still the same result.

But in OS 10.4, it boots no problem.


Any ideas?

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It certainly sounds like your macOS 10.10 image has been damaged. If you have a Trusted Backup (of YOUR files from that drive, not necessarily MacOS), you can do a Re-Install-in-place. By design, this re-writes over 350,000 files that make up MacOS. It does not bulk-erase any non-System directories, so all your files and Applications are intended to be preserved.


But if your drive is near failure, this could push it over the cliff into complete failure (thus the need for a Backup before you begin.)

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Nov 21, 2017 10:28 AM in response to jjwithers1 In response to jjwithers1

I don't know how prepared you are to try different things but I had that Mac and I installed and ran many different systems without issues and thats filling that computer with a sata blu ray optical top bay, two SSD in lower optical bay and two other SSD in the main trays with two mechanical hard drives for data. . So I always had at least four operating system ready to go at any time. I always had one rule I never broke and that was to erase or partition the target drive with the Disk Utility of the system I was going to install onto it.

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Nov 21, 2017 10:28 AM in response to jjwithers1 In response to jjwithers1

It certainly sounds like your macOS 10.10 image has been damaged. If you have a Trusted Backup (of YOUR files from that drive, not necessarily MacOS), you can do a Re-Install-in-place. By design, this re-writes over 350,000 files that make up MacOS. It does not bulk-erase any non-System directories, so all your files and Applications are intended to be preserved.


But if your drive is near failure, this could push it over the cliff into complete failure (thus the need for a Backup before you begin.)

Nov 21, 2017 10:28 AM

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Nov 21, 2017 10:28 AM in response to jjwithers1 In response to jjwithers1

I don't know how prepared you are to try different things but I had that Mac and I installed and ran many different systems without issues and thats filling that computer with a sata blu ray optical top bay, two SSD in lower optical bay and two other SSD in the main trays with two mechanical hard drives for data. . So I always had at least four operating system ready to go at any time. I always had one rule I never broke and that was to erase or partition the target drive with the Disk Utility of the system I was going to install onto it.

Nov 21, 2017 10:28 AM

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Question: 2008 mac pro boots in 10.4 but not 10.10