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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Mac Pro, tons of upgrades, NO video on boot

This may be outdated, but I’ll give it a try.

Mac Pro 5,1. Upgraded to 6-core 3.33 processor a few years back, with Radeon 560 video card, USB3, 48GB RAM, 500GB SSD boot drive. The machine screams; it is WAY faster than my 2017 iMac 3.5. Everything functioned normally for a long time under 10.14.6. I moved offices and powered the Mac Pro down. It sat for about three months.

Now upon boot there is NO video output; the screen is black from either the DVI or HDMI output of the card. The monitor is known good.

The machine POSTs and chimes normally, but then it stops and never displays any image on screen at all.

I have followed the Mac Technician manual to the letter more than once beginning in the “No Video” section on page 53: http://tim.id.au/laptops/apple/macpro/ma...

Those steps include replacement with a known good (alternate) video card, NVRAM and SRAM resets, etc. I have reinitialized the SSD with a new copy of 10.14 and tried booting from a regular 3.5” drive. I have even replaced the backplane board.

I went back to page 33 in the manual, disassembled the machine, and tried to start from scratch. Everything works as predicted, with one exception:

On page 36, the manual says: “Shortly after boot start, verify that a red-colored LED is illuminated within the optical audio-out jack at the rear of the Mac Pro. If so, software drivers have been loaded.”

In fact, that LED does not illuminate on either backplane board, and the manual does not offer any guidance in this case. (“If the red is not illuminated, then do … what?) I’m dubious that this is a critical piece of this puzzle, but it’s the only thing I can find that’s not loading as predicted.

Anybody have any ideas here? I’m not a technician but I’m a logical guy and I’m more than willing to take things apart if it might help (obviously). If nobody has any ideas, I’ll just try to sell it for parts, but I’d like to get it running if at all possible.

Thanks!

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Hey, I just wanted to circle back here to say thanks. I felt like an EMT with a set of coronary paddles. None of the suggestions worked the first time around, or even the second or third. But I’m nothing if not stubborn, and after swapping various components, and after many attempts, installing 10.13 on the system SSD, and then updating the firmware (again), finally brought it back to life.

So thanks a lot for taking the time to suggest that; I’m not certain I would have gone that route, since it had worked for a long time on 10.14. I really appreciate all the time you took. It might not have been much, but the best kind of favor is the one that costs little, but has tremendous value. This was one of those. Thanks again.

da

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My suspicion would be an issue with Mojave. Surely you have one drive in the machine with a lower system like Sierra to eliminate a possible Metal problem.

Was this originally a 4,1? If you do still have an older video card I would also try that.

Did you use DosDude to upgrade or Apple?

While upgrading the systems over the years, did you ever skip a major system? (Thus missing a possible firmware update).

Have you ever changed out the PRAM battery?

I have a 2010 I’m building right now and taking to the Xeon X5690 3.46GHz CPUs.

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Hey, man, thanks for taking the time.

I can initialize a drive with Sierra or High Sierra and try that. I think I did it but I’m not positive, and it only takes a few minutes to try again.

I don’t think I skipped a system upgrade but I’m not positive. In any case, if it wasn’t clear the machine ran happily on 10.14.6 for many months, so it would be strange to suddenly crap out for that reason.

I don’t have an older video card, unfortunately, so that could be a potential issue, but again — it ran before so that seems unlikely, agree?

The start-from-scratch steps in the tech manual require taking the battery out, so I’ve done that. I’ll try again.

I’ll report back after trying these steps. Again, many thanks — I don’t take it for granted.

da

Start with Sierra as there's a firmware update that goes with it. If you do not remember if you did it, press and hold the power on button and see if it starts flashing rapidly.

The APFS formatting started messing us up when it hit with High Sierra.

The current problems could be related to an update and a lot of times the DosDude original patch stops working when that update hits.

da

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bravermanp sarà eternamente grato.
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