MP 1,1-5,1 Mac Pro 4,1 No Boot, DSI510 LED lit

[Conradish006]

Hello all.
I have a 2009 Mac Pro 5,1 with a single processor. It was randomly freezing and crashing. After posting on here with the crash reports, I was told it was the northbridge was not cooling properly. I bought the metal screws with springs for the heat sink since I’d lost the old springs.

When I attempted to boot it for the first time, I was met with the DSI510 light on. The debug lights are normal and all the usual are on. And after I shut it down, the overtmp CPUA light was on. I messed around with the system for a while. Disconnected the GPU, drives, and peripherals. Still nothing, the DSI510 light turns on and the fans spin. I’ve replaced the CMOS battery and tried several other things including swapping it out for an old Nehalem CPU to no affect.

This is extremely frustrating as I have already spent quite a good sum of money to fix this thing. And I really need it up and running as it’s main desktop computer.

 

[mattspace]

When I attempted to boot it for the first time, I was met with the DSI510 light on. The debug lights are normal and all the usual are on.

have you been through the service technician's manual to look for an explanation / diagnosis / fix?

 

[Macschrauber]

Is there a DisplayPort Display attached?

 

[KeesMacPro]

The Technician Guide :

https://tim.id.au/laptops/apple/macpro/macpro_early2009.pdf

 

[Conradish006]

No DisplayPort monitor plugged in. I did the minimum configuration testing with nothing in. And everything was normal. I attempted to reset the NVRAM but not sure if it worked. Still super confused as to why it's doing this. The CPU doesn't even get warm in this state, and it's definitely not missing either.

 

[wolf1734]

Bonjour tous le mondes, j'ai besoin d'aide mon mac pro deux processeurs ne démarre plus j'ai les deux led rouge des cpu A et cpu B qui clignote toujours des que le mac est sous tension. Quand j'appuis sur on rien ne ce passe, pouvez vous me dire si c'est la carte mère ou l'alimentation qui sont foutu merci a vous pour vos réponses.

 

[Macschrauber]

English only

 

[wolf1734]

Hello everyone, I need help my mac pro two processors does not start anymore I have the two red led of cpu A and cpu B which always flash as soon as the mac is powered on. When I press on nothing happens, can you tell me if it's the motherboard or the power supply that is screwed up, thank you for your answers.

 

[Conradish006]

Turn the computer on. Press the button for the diagnostic LED’s in front of the PCI-E fan. If the 5 volt standby light is orange. Then the power supply is fine. If it isn’t, then you either have a problem with the backboard or the power supply.

 

[wolf1734]

I cannot turn on the computer the leds on the motherboard of cpu A and cpu B flash but when I press the button on the computer does nothing it does not start. when i press the button on the motherboard i have the 5v stby led which lights up in orange. is the food that is dead?

 

[Conradish006]

Does it click or does anything turn on when you press the power button?

 

[Conradish006]

Try jumping the sys_pwr pads with a paper clip or wire. If the computer turns on then you have a bad front panel board.

 

[wolf1734]

when I press the button, the cpuA and cpuB indicator lights remain on and no longer flash.
otherwise the paperclip I put it between the two points which are in the red circle.