Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

MP 6,1 Mac Pro 2013 won't turn on

naujoks

naujoks

macrumors 6502
Original poster
Jul 6, 2008
301
59
London, UK
I have a Mac Pro 2013 which was working fine until today, when on booting the WiFi mouse wasn't working.
I held the power button pressed to power down the machine.
When trying to restart it, the fan won't spin up and there's no boot chime. The only sign of life is the lights at the back coming on, staying on for 15 seconds and then go off again.
What could be the problem?
 
One thing I noted is that all lights at the back are lighting up, except the power button itself.
 
Yes, I see that now.
I did the NVRAM reset (no change), but the SMC reset it simply unplugging it for a bit and then turning it back on?

Desktop computer
If your Mac isn't a laptop computer, follow these steps:
Shut down your Mac, then unplug the power cord.
Wait 15 seconds, then plug the power cord back in.
Wait 5 seconds, then press the power button to turn on your Mac.

Either way, I did that and it still doesn't work.
I read that a run down SMBIOS battery might be the reason for the fault, so I swapped that for a new one, although the old one was at 3.06V and probably fine.
 
naujoks said:
I've tried the PSU from another Trashcan and also swapped the CPU.
Same result.
Click to expand...
Are you in position to swap I/O boards ?

Screenshot 2024-03-25 at 22.05.15.png
 
So, you have cleard NVRAM, reset the SMC, swapped PSU, I/O board nad Logic Board, and its still the same problem ?

You could try with different, 100% good RAM modules before going to CPU board and after that I'm out of ideas. There is no reason to suspect on GPUs or NVMe with those symptoms.
 
That is correct. I've swapped the CPU as well.
So really the issue can only be with the CPU board. But why should that break all of a sudden?
 
naujoks said:
That is correct. I've swapped the CPU as well.
So really the issue can only be with the CPU board. But why should that break all of a sudden?
Click to expand...
who knows? 10 year old computer box can break any time. Time to move to newer machine.
 
Hi, I am on the same boat. Exactly the same symptons and I have tried everthing too: swapped PSU, I/O board, CPU, memory, etc. even changed the BR2032 battery for a new one... the only thing I haven't swapped is the circle logic board and the CPU riser card (the one that contains the CPU itself and the RAM slots) so I guess the problem must be in one of these cards but how should I know for sure which is the faulty one? It doesn't make sense that a computer doesn't turn on (well sometimes it does turn on, sometimes takes several minutes to turn on and in most cases it doesn't do anything at all so looks like random pattern) due to any of these two boards I haven't swapped, right? or are they?

I have ran ASD several times and every time the results are the same: NO issues at all !!!
 
I have the same problem the diagnostic lights are on seem ok according to service manual. Of I strip the system down and remove the smbios battery for few mins then put it back in and put system back together press power it will boot eventually and can be used but if I turn it off I am back to it not booting again. If you press the power button when it's like this not booting you get not chimes so I have no idea of the resetting of NVRAM and SMC have worked or not.
 
54bombay said:
I have the same problem the diagnostic lights are on seem ok according to service manual. Of I strip the system down and remove the smbios battery for few mins then put it back in and put system back together press power it will boot eventually and can be used but if I turn it off I am back to it not booting again. If you press the power button when it's like this not booting you get not chimes so I have no idea of the resetting of NVRAM and SMC have worked or not.
Click to expand...
I replaced the small battery inside and did a little checking of cables etc now it’s working great boots first time.
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back