MP 1,1-5,1 Mac Pro 5,1 CPU Tray Light

[christiann]

Hello,

I have a Mac Pro 4,1->5,1 (it’s the 2.66GHz 8GB model). I have a EVO 860 SSD as well as an NVMe drive. I have a Mac Edition GTX 680 for the graphics. Lately, I have been flashing GTX 680s and refurbishing them. Well, today, I got a red light on the CPU tray. Is it a power/overheating issue? I unplugged it for over 24 hours and still the same issue. It’s so weird!

Does anyone know what this is? I’ll probably buy a new CPU tray. Let me know! Thank you.

 

[Macschrauber]

yes, this should be CPU Overtemp

Check the temperatures and Fan speeds with a tool like Macs Fan Control.

 

[christiann]

yes, this should be CPU Overtemp

Check the temperatures and Fan speeds with a tool like Macs Fan Control.

I can’t boot up the tower….

I can’t reset PRAM… I tried resetting SMC and no dice.

 

[arw]

Could it be a connector problem of the sensor in the CPU heatsink? Did you remove it recently?
I'm not familiar if the LED differentiates between CPU DIE and heatsink.

edit: No solution on Apple's forum except swapping the video cable.
Or faulty PCIe devices. Have you tried another GPU?
https://discussions.apple.com/thread/3505197

edit2: from the service manual:

A red illuminated LED indicates the associated processor may be missing or in overtemp state (PROCHOT).

 

[christiann]

Could it be a connector problem of the sensor in the CPU heatsink? Did you remove it recently?
I'm not familiar if the LED differentiates between CPU DIE and heatsink.

edit: No solution on Apple's forum except swapping the video cable.
Or faulty PCIe devices. Have you tried another GPU?
https://discussions.apple.com/thread/3505197

edit2: from the service manual:

I never really touch the CPU tray. I have 5 GPus and no luck! It seemed to break while using an ASUS GTX 680 though.

 

[arw]

The LED is named "DSI510 CPU Tray LED" maybe this helps.
Have you tried another cable?

https://forums.macrumors.com/threads/macpro-5-1-diagnostic-led-dsi510-strange-problem.2242504/

What really made the diagnostic led lit was the DisplayPort cables!

 

[christiann]

The LED is named "DSI510 CPU Tray LED" maybe this helps.
Have you tried another cable?

https://forums.macrumors.com/threads/macpro-5-1-diagnostic-led-dsi510-strange-problem.2242504/

Hmm, I only use HDMI and DVI. I tried both

 

[arw]

Ok, last try:
The classic Northbridge heatsink rivet failure:

Red Diagnostic LED DSI510 and Mac Pro not starting - broken Northbridge heatsink rivet

Writing this thread on my Mac Mini because my 8 year old Mac Pro 4,1 (single CPU) is now out of order. My Mac Pro shows red LED DSI510 and is not starting anymore. No chime, but fans running, GPU and hard disks are powered. According to this manual (picture on page 32)...

forums.macrumors.com

This means removing the CPU heatsink for verifying.

 

[christiann]

The LED is named "DSI510 CPU Tray LED" maybe this helps.
Have you tried another cable?

https://forums.macrumors.com/threads/macpro-5-1-diagnostic-led-dsi510-strange-problem.2242504/

Hey there, I will read this. Thank you so much for your help

 

[christiann]

Ok, last try:
The classic Northbridge heatsink rivet failure:

Red Diagnostic LED DSI510 and Mac Pro not starting - broken Northbridge heatsink rivet

Writing this thread on my Mac Mini because my 8 year old Mac Pro 4,1 (single CPU) is now out of order. My Mac Pro shows red LED DSI510 and is not starting anymore. No chime, but fans running, GPU and hard disks are powered. According to this manual (picture on page 32)...

forums.macrumors.com

This means removing the CPU heatsink for verifying.

I’m going to buy a new CPU tray. I’m nervous about damaging the CPU.

 

[Matty_TypeR]

Its an easy service to remove the CPU heat sink and check the plastic clips that hold the N/bridge heatsink on CPU tray. Remove and clean CPU heatsink, blow fuff and dust from inside it. Remove CPU board from tray, and remove the push in plastic sprung clips that hold N/B heat sink to CPU board. replace thermal paste on N/B heatsink and replace plastic push in sprung clips. clean surface of CPU and base of CPU heatsink. Replace thermal paste on CPU then replace the CPU heat sink. you cant damage the CPU unless you remove it from the board and damage the CPU pins in the CPU socket. If the CPU is damaged you can change it easily and replace with an upgraded CPU or the same. Just take your time and it will be fine.

Purchasing a new CPU tray is no guarantee that the Plastic N/B retaining clips are not brittle and broken. or could break in the near future. then you will be stuck doing the same thing.

 

[christiann]

Its an easy service to remove the CPU heat sink and check the plastic clips that hold the N/bridge heatsink on CPU tray. Remove and clean CPU heatsink, blow fuff and dust from inside it. Remove CPU board from tray, and remove the push in plastic sprung clips that hold N/B heat sink to CPU board. replace thermal paste on N/B heatsink and replace plastic push in sprung clips. clean surface of CPU and base of CPU heatsink. Replace thermal paste on CPU then replace the CPU heat sink. you cant damage the CPU unless you remove it from the board and damage the CPU pins in the CPU socket. If the CPU is damaged you can change it easily and replace with an upgraded CPU or the same. Just take your time and it will be fine.

Purchasing a new CPU tray is no guarantee that the Plastic N/B retaining clips are not brittle and broken. or could break in the near future. then you will be stuck doing the same thing.

Do you know what hex screwdriver I need?

 

[Matty_TypeR]

the hex key required for heat sink removal is 3mm

 

[christiann]

the hex key required for heat sink removal is 3mm

I messaged the guy that sold me it and he said he would give me a CPU tray out of another tower he has (it’s from his old work). I’m going to try swapping it. If it doesn’t work, I will try your solution. Thank you so much for your in-depth response!!!

 

[Matty_TypeR]

I hope it works out for you. Good luck!

 

[christiann]

I hope it works out for you. Good luck!

Thank you!