MP 6,1 No Video with chime and all green LEDs

[Manu86001]

Hi everyone,

first of all happy holidays!

I picked up a Mac Pro 6.1 (Trashcan) with 3.5 Ghz and 32 Gigs of Ram a while ago.
Since I finally have some time to work on this project I hope someone can help me with that.

The Mac gives the startup chime. On the backside of the machine all ports illuminate and then only the power button stays lid.
I have no picture using HDMI and an TB2toHMDI adapter.

If I press the diag button I get a green light from LED 1 and 4 (and least thats what I am counting ^^).

I already changed the Coin Battery and the termal paste on both GPU.

I wonder if anyone could help from here. Are the GPUs faulty or is it a different issue?


It would be amazing if someone could help me out with this one

 

[Manu86001]

Update from my part:

after some further testing I get an all green from the diag button. I tried swap GPUs A & B (I know thats not the best way to troubleshoot things^^).
However I still have no picture on my mac.

Anyone out there that had this fault- was it the GPU(s) or the CPU (board)?

 

[krakman]

have you tried the usual trouble shooting tips such as reset NVRAM and SMC controller?

Also remove the RAM and just try one stick at a time. I experienced a lot of weird problems caused by a faulty stick of ram.

Use an ethernet cable to connect to you router and see if the computer shows up on the network?

Plug in a usb drive and or thunderbolt device with activity LEDs, to check if the I/O board is functioning?