MP 1,1-5,1 Mac Pro 5.1 Early 2009 , shutdown while video, photo edit

[shadow1926]

Hello,
I have a problem with my Mac Pro 5.1. While I edit my video in Premiere Pro or photo in Photoshop Lightroom my computer turn off, I see black screen and I must once again press turn on button. I replace thermal paste in CPU, I reset SMC and NVRAM, problem is not solved. When I surf on internet to safari or youtube computer works well, if I try edit on timeline my video MAC shutdown. I installed Mac Fans Controll , but my windmills works well. Please help....!

P.S Sorry for my bad English guys.

 

[Flocarino]

Is the Northbridge heatsink secure in place, no rivets brocken/loose?

 

[JedNZ]

Check out these MacRumors posts:

clip (snap rivet) for Northbridge heat-sink on 2009 Mac Pro 2X2.26

De-Dusting & Northbridge temp reduction in Dual CPU cMP 4,1 & 5,1
https://forums.macrumors.com/thread...dge-heat-sink-on-2009-mac-pro-2x2-26.1637891/
or for more…

 

[shadow1926]

Where I find this? You talk about these screws with springs? I tighten heatsink enough strong.


EDIT

Now I can see while my Mac turn on , red diagnostic led flashes one time

 

[Macschrauber]

Can you force the shutdown by running furmark gpu benchmark ?

Then what GPU and how is it powered ?

 

[shadow1926]

Now I can see while my Mac turn on , red diagnostic led flashes one time

Can you force the shutdown by running furmark gpu benchmark ?

Then what GPU and how is it powered ?

How start running gpu benchmark?

 

[Macschrauber]

How start running gpu benchmark?

https://www.geeks3d.com/gputest/