MP 1,1-5,1 Mac Pro 3.1 Not open After boot sound.

[Hatıra Polat Arkalı]

Hello every one

I am new in this forum.

I have a mac pro 3.1 And I have some problem with my computer.

There is no video after Apple opening sound.

I was try many time Pram and nvram reset but it is not working.

I was try all options I was change ram modules and risers, And I was try 3 diffirent vga card and I was try All PCIe Ports. ( all of them is orginal apple display cards and working well on other mac pro - (Radeon HD 2600 XT & Gforce 7300 Gt )) But no succes result.
And there is no error (red) Led on indicator. Just I see 2 led. led 2 (yellow ) and 8 (green) is on when I click check button.
I have suspect about PCIe Slots or controller of them.
And There is no Any Apple service Close of me.
is there any fuse or any Component, Caused this ? If I know I can change myself.

 

[barbu]

Did you try the 3x PRAM reset? Meaning there is the "single" reboot PRAM reset and there is the "three" reboot PRAM reset. Try holding down CMd-Opt-P-R for three full reboots, then release and it reboots one more time. See if that helps.

 

[Hatıra Polat Arkalı]

Did you try the 3x PRAM reset? Meaning there is the "single" reboot PRAM reset and there is the "three" reboot PRAM reset. Try holding down CMd-Opt-P-R for three full reboots, then release and it reboots one more time. See if that helps.

Yes Barbu I try many time. but it is not fix my problem.

I Guess I find my problem. My problem is No GPU power on logic board.
This morning I was reflash my Asus 5770 Vga Card For mac. And this card have Power connector for extra power. and I Pluged power connector to dvd power supplay cable. and My mac open correctly.

nvidia 7300 and Ati 2600 Card don't have extra power connector. and that supplay power from logic board.

Anybody know How can I fix Logic board Gpu Power?

 

[joot]

I have a similar issue with my MP 5,1 + 1080Ti with High Sierra and dark screen after booting. My issue might be Nvidia driver not compatible with the build of my High Sierra. My build # is 17G11016. I also have a RX 580 video card and that card works fine. Problems only with Nvidia based cards: gtx 980, gtx 980Ti, 1080Ti

 

[Hatıra Polat Arkalı]

I have a similar issue with my MP 5,1 + 1080Ti with High Sierra and dark screen after booting. My issue might be Nvidia driver not compatible with the build of my High Sierra. My build # is 17G11016. I also have a RX 580 video card and that card works fine. Problems only with Nvidia based cards: gtx 980, gtx 980Ti, 1080Ti

Hello joot I guess We don't have same issue.
I am thinking my problem is about power supply. Today I will focus my Psu.
I will check all output voltage. Maybe there is a damaged component on logic bord that caused problem.
I am here for find correct answer.

 

[Hatıra Polat Arkalı]

I checked psu With my Electronic technician Friend. All Voltages is correct. İt's mean my Psu Working correctly.

İf Graphic card have extra power connector, it is working correctly.
But if graphic card just using Pcie slots Voltage it is not working.

When I install double gpu I can see Gpu information on Mac os.
But I can not get video from thats video cards

Re flashed Asus 5770 with Extrarnel power supply . -------> Working Good
Oginal Radeon HD 2600 XT No extra power connector ------> Not Woking
Oginal Gforce 7300 GT No extra power connector ------> Not Woking

 

[Macschrauber]

You can power the gpu directly from the psu if the logic board failed. Like the pixlas mod.

 

[Hatıra Polat Arkalı]

You can power the gpu directly from the psu if the logic board failed. Like the pixlas mod.

Yes I can do it like this And My computer is working With Extra power already. But I need more technical information for repair that logic board.

 

[Macschrauber]

Then you must investigate the board traces. We dont have schematics, sadly...