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MP 1,1-5,1 Mac Pro 4,1 Dual Cpu No Chime on Boot Up and Black Screen

Simon Baggersgaard

Simon Baggersgaard

macrumors newbie
Original poster
Mar 23, 2020
6
0
Hello Everyone,

Have been struggling with this problem for one of my Mac Pro 4,1 for a while now and I have seen my self come to a dead end.
I simply have no idea what is causing the problem.
Is a 2009 4,1
model nr: a1289
Serial nr: CK02404Y20H

I have tried changing the CPU tray and it makes no differens.
I Have teste with different stock GPUs and I seams to make no differens.
I have tried all the pcie slots.

I have attached a picture of the diag light, if that helps.
The OVTMP CPUA and OVTMP CPUB LEDs do not flash red when a power supply is connect or disconnected.

There is power in the USB ports, but can't seem to get the Mac to react to it.

Pleas help

if any information is need I will provide you as soon as possible

Kind regard Simon

And thanks in advance
 

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HAve you reset the pram?

Press Cmd + Alt + P + R on start up

keep the buttons pressed until it chimes for the 3rd time

Sear this forum for PRAM rest for more info
 
I have tried reseting the PRAM and nothing happens. I don't know if its the Mac no reacting to my keyboard of if the Mac simply does not get the command.
 
It does not seem to let me do a PRAM reset, It does not reach to the keyboard.

But now it seams to flash red when I plug it into a power source
 
Last edited:
Alternative SMC Reset for Mac Pro (2012 and Earlier)

If you have a 2012 or earlier Mac Pro that isn't responding to the normal SMC reset, you can force a manual SMC reset by using the SMC reset button located on the Mac Pro's motherboard.

  1. Shut down the Mac.
  2. Unplug the Mac's power cord.
  3. Open the Mac Pro's side access panel.
  4. Just below the Drive 4 sled and adjacent to the top PCI-e slot is a small button labeled SMC. Press and hold this button for 10 seconds.
  5. Close the Mac Pro's side door.
  6. Reconnect the Mac's power cord.
  7. Wait five seconds.
  8. Start the Mac by pressing the power button.

Now that you have reset the SMC on your Mac, it should be back to operating as you expect. If the SMC reset didn't fix your problems, combine it with a PRAM reset. Although the PRAM works differently than the SMC, it can store a few bits of information that the SMC uses.
 
@krakman
please don't spread nonsense!


this button has nothing to do with the SMC.

Screenshot 2020-03-30 at 14.22.42.jpg




the SMC reset button would have to be soldered first!


macpro_51_diag_led.png




and with the power unplug and the 15 sec before replug you do the SMC reset ; -)



.
 
Last edited by a moderator:
Thanks,
I have tried some new thing.
now I can get a white image and a start up chime with one Cpu attached in the Cpu A socket but can't get I to do the same with both Cpus attached. I have tried switching the Cpus around and both works in the cpu a socket.
what to do?
 
Simon Baggersgaard said:
Thanks,
I have tried some new thing.
now I can get a white image and a start up chime with one Cpu attached in the Cpu A socket but can't get I to do the same with both Cpus attached. I have tried switching the Cpus around and both works in the cpu a socket.
what to do?
Click to expand...

are these the officail CPUs that came with the mac as standard or did you fit these cpus? and what is the model number of the cpu?
 
I have no come to the conclusion that I can get the Mac to run normally with only one CPU attached in CPU A, but as soon at CPU B connects to the Mac it shutoff and everything is back to the same as before where I can get it to start with no chime and no video.
any one know what to do about this?
 
Kouvman said:
If I don’t have a solder SMC can I jumped with screwdriver or something else?
Click to expand...
SMC auto-reset itself if you disconnect the power cable from the PSU for 20 seconds. SMC button was only needed while Apple developed the SMC firmware, no production boards have it and you don’t need to short-circuit the pads, just remove power.
 
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tsialex said:
SMC auto-reset itself if you disconnect the power cable from the PSU for 20 seconds. SMC button was only needed while Apple developed the SMC firmware, no production boards have it and you don’t need to short-circuit the pads, just remove power.
Click to expand...
I did everything that the other user tell above, but still the Mac Pro is not able to boot and none sound was appear and none signal is appeat on my display.
 
Kouvman said:
I did everything that the other user tell above, but still the Mac Pro is not able to boot and none sound was appear and none signal is appeat on my display.
Click to expand...
Download the Technician Guide and follow the diagnose steps. If you don't have EFI DONE, you have a brick.
 
Simon Baggersgaard said:
I have no come to the conclusion that I can get the Mac to run normally with only one CPU attached in CPU A, but as soon at CPU B connects to the Mac it shutoff and everything is back to the same as before where I can get it to start with no chime and no video.
any one know what to do about this?
Click to expand...
Maybe some thing wrong with the cpu...there was another thread where someone had a pair of cpus which worked fine on their own but failed to work together.

The 3.46 4 core cpus (x5777???) Are really cheap on ebay... why not buy a pair and try them out? You will probably have to remove the heat sink though!
 
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