Mac Pro 2012 5,1 with working Orig ATI Radeon HD5770 but, can't get OS to load

[ddotjay85]

Can't get OS 10.11.6 nor High Sierra latest version to load with Original Mac Pro OEM installed ATI Radeon HD5770. What happens, is it will load and the progress bar under the apple will load about half way, before screen goes black. I have two of the original HD5770 cards and neither will go beyond that half mark. High Sierra will load with my rx580, but the point is to be able to use my Original card for boot screen access. I'm running 12 core dual 2.4ghz cpus until monday (upgrading to 2x 3.33ghz, or 2x 3.46ghz). I've seen tons of people using their original HD5770 to boot both of those OS'... but I cant. PLEASE HELP!!!!!!

Current setup is 2012 5,1 Mac Pro - 32gb ram - 12 core (2x 2.4ghz 6 core xeon cpus) High Sierra Latest Version, and a dual boot with El Capitan latest version.

 

[pigoo3]

Just to be 100% sure. Is this definitely an original 2012 Mac Pro 5,1? I know there are lots & lots of folks upgrading the firmware of their Mac Pro's to simulate being a newer Mac Pro...plus lots of CPU or CPU tray upgrades being done to run newer, faster, and more CPU's.

Thanks,

- Nick

 

[ddotjay85]

Just to be 100% sure. Is this definitely an original 2012 Mac Pro 5,1? I know there are lots & lots of folks upgrading the firmware of their Mac Pro's to simulate being a newer Mac Pro...plus lots of CPU or CPU tray upgrades being done to run newer, faster, and more CPU's.

Thanks,

- Nick

Yes. Absolutely positive Original 2012 Mac Pro 5,1. No upgrade.

 

[pigoo3]

...but the point is to be able to use my Original card for boot screen access.

Another question...are both of these 5770 video cards original Apple 5770's?

There are two basic types of this video card...an Apple version (with Apple/macOS firmware)...and a windows version (doesn't have Apple/macOS firmware). While many windows video cards will work in a Mac Pro...sometimes when using windows video cards you lose the boot screen. And with Windows video cards...maybe you get the boot screen with one macOS version...but not a different macOS version.

I know these questions might seem silly...but need to know the nitty-gritty details. Usually this boot screen issue only happens if one or both of the 5770's are not an original Apple version of the 5770 (maybe one or both are Windows cards).

HTH,

- Nick

 

[ddotjay85]

Another question...are both of these 5770 video cards original Apple 5770's?

There are two basic types of this video card...an Apple version (with Apple/macOS firmware)...and a windows version (doesn't have Apple/macOS firmware). While many windows video cards will work in a Mac Pro...sometimes when using windows video cards you lose the boot screen. And with Windows video cards...maybe you get the boot screen with one macOS version...but not a different macOS version.

I know these questions might seem silly...but need to know the nitty-gritty details. Usually this boot screen issue only happens if one or both of the 5770's are not an original Apple version of the 5770 (maybe one or both are Windows cards).

HTH,

- Nick

These are both original non-flashed apple oem versions. 1 DVI and 2 mini display. I only try them individually, never paired.

 

[pigoo3]

These are both original non-flashed apple oem versions. 1 DVI and 2 mini display. I only try them individually, never paired.

Thanks for confirming. Yes sounds most definitely like original Apple 5770's since they have the mini display ports on them.

Let me think on this a bit longer. In the meanwhile you could try two things:

- Boot into the Recovery Partition of your HD or SSD...launch Disk Utility...and try repairing the disk.
- If you don't already have it...download & install the free maintenance app called "Onyx". Launch Onyx...then click on the "Automate" or "Automation" button (using the default settings)...and let it do it's thing.

Hopefully one of these procedures will fix things.

- Nick