MP 1,1-5,1 cMP 5,1 - AHT won't run- bad backplane?

[GoJohnGo]

It looks like your cMP is a 2009 flashed 5,1.

ASD and AHT is very very hardware specific. Even though 3S149 is for 5,1, but you still need to have the whole set of native 5,1 hardware to make it able to diagnose properly.

e.g. No hard drive may be the issue. Or 3S149 doesn't expect HD4870 (this is a 4,1 graphic card, not 5,1 graphic card).

Anyway, for your info, I can run ASD 3S149 on my 2009 flashed 5,1

https://forums.macrumors.com/threads/opencore-on-the-mac-pro.2207814/page-127?post=28690275#post-28690275

But this is with a Radeon VII that can only display via UEFI GOP in ASD, and by using OpenCore.

Sorry, should have mentioned it's a mid-2010. My other 5,1 is a mid-2012. I also have an early 2009 4,1 which is still a 4,1.
My understanding is that 3S149 should be appropriate for both the mid-2010 and mid-2012. I use 3S132 for the early 2009 and it runs fine on that machine. I did try 3S132 on the mid-2010, but it did not work (I don't remember the specific behavior at the moment).

I did pull the 4870 from the 4,1 and put it in the mid-2010 I've been testing with, as that's the only genuine stock Mac video card I have. I do have some other video cards I could try, but I don't think that's the issue. Having a hard drive installed didn't make any difference.

Your link shows ASD OS 3S149, which I can run fine without issue. Are you able to run ASD EFI 3S149? That's the one that's hanging.

 

[h9826790]

I did pull the 4870 from the 4,1 and put it in the mid-2010 I've been testing with, as that's the only genuine stock Mac video card I have. I do have some other video cards I could try, but I don't think that's the issue. Having a hard drive installed didn't make any difference.

Your link shows ASD OS 3S149, which I can run fine without issue. Are you able to run ASD EFI 3S149? That's the one that's hanging.

I see. That make sense now.

I never try the ASD EFI 3S149. But why you must run the ASD EFI if the ASD OS works?

Basically, except extensive memory test, there is no benefit to use ASD EFI.

 

[GoJohnGo]

I see. That make sense now.

I never try the ASD EFI 3S149. But why you must run the ASD EFI if the ASD OS works?

Basically, except extensive memory test, there is no benefit to use ASD EFI.

You guessed it; I want the extensive memory test.

 

[h9826790]

You guessed it; I want the extensive memory test.

I see, but if you can run AHT extended test, I personally believe there is no need to run ASD memory test.

The cMP use ECC RAM, undetected memory error almost impossible. One test should be good enough.

 

[GoJohnGo]

I see, but if you can run AHT extended test, I personally believe there is no need to run ASD memory test.

The cMP use ECC RAM, undetected memory error almost impossible. One test should be good enough.

I did end up running AHT extended test, but it still baffles me that Apple would ship software (ASD EFI 3S149) that is just plain broken. Tried it again on a new (to me) mid 2012 dual processor, stock as they come (except for RAM), with the original drive and Radeon 5770. Still hangs at the same spot. I wonder if anyone has got it to run successfully?