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MacPro 5,1 is not booting anymore

C

Coyote2006

macrumors 6502a
Original poster
Apr 16, 2006
512
233
Hi, Mac MacPro 5,1 is not booting anymore. It starts and the GPU-Fan seems to run endlessly but the screen stays black. The Mac is not booting. I've already switched RAM but without success. Any ideas what could be wrong?
 
Coyote2006 said:
Hi, Mac MacPro 5,1 is not booting anymore. It starts and the GPU-Fan seems to run endlessly but the screen stays black. The Mac is not booting. I've already switched RAM but without success. Any ideas what could be wrong?
Click to expand...
Do you have a Mac EFI GPU to check if it's a hardware or a software problem?
 
Coyote2006 said:
I've got the same problem with the Radeon 4870 and a flashed 680.
Click to expand...
If you don't get the chime and nothing shows on the screen, the next step is to check diagnostics less of the logic board. If EFI led is off, you have a brick.
 
Coyote2006 said:
no chime, just the fan of the GPU running
Click to expand...
Like I wrote, you need to check the diagnostics leds on the backplane. If EFI is off, you have three options:

you have 3 options:
  1. Replace the backplane.
  2. Buy a Mac Pro MATT card.
  3. Desolder, externally reprogram the SPI flash memory, solder again, you can read all the process starting here #929.
 
Thanks a lot tsialex. How do I check the diagnostics leds on the backplane? Sorry, I've never done this.
 
unfortunately, no
[doublepost=1544045756][/doublepost]You think that this might be related to the PSU?
 
Last edited:
Thanks ldfa, you seem to be right. Looks like this leads to problems on the processor board.
 
Last edited:
Coyote2006 said:
Thanks ldfa, you seem to be right. Looks like this leads to problems on the processor board.
Click to expand...
Your Mac Pro have an upgraded the CPU from the Apple original one? It's a single or dual CPU? It's a 4,1>5,1 or a real 5,1?
 
4,1>5,1 (single CPU) and I updated the CPU about 3 years ago. One of the Northbridge rivets was/is not completely upright. Maybe that could cause the problem. I'll try to organise new rivets, clean the CPU and the Northbridge chip and reinstall it. Do you have a sourse for the rivets? I just found some in China and the delivery takes about 2-3 weeks.
 
Coyote2006 said:
4,1>5,1 (single CPU) and I updated the CPU about 3 years ago. One of the Northbridge rivets was/is not completely upright. Maybe that could cause the problem. I'll try to organise new rivets, clean the CPU and the Northbridge chip and reinstall it. Do you have a sourse for the rivets? I just found some in China and the delivery takes about 2-3 weeks.
Click to expand...
I know that you can buy the Mac mini CPU heatsink original ones from Digikey, if I remember correctly, but I bought a package of 100 of the generic one from China last year, 60 days to arrive here. The Mac mini ones fit better than the generic ones. I never saw the real Mac Pro ones for sale.
 
tsialex said:
I know that you can buy the Mac mini CPU heatsink original ones from Digikey, if I remember correctly, but I bought a package of 100 of the generic one from China last year, 60 days to arrive here. The Mac mini ones fit better than the generic ones. I never saw the real Mac Pro ones for sale.
Click to expand...

Thanks for the info :)
 
tsialex said:
Sorry, I got it from a post on netkas, years ago. Tried to found it now, but didn't succeed.
Click to expand...

ok, no problem. thanks for your great support!

I've also found and ordered a processor board on ebay. At least I have a backup board then :)
 
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