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MP 1,1-5,1 5,1 powers on, then off a few seconds later

lmerdan

lmerdan

macrumors newbie
Original poster
Feb 3, 2009
5
0
So when I picked up this machine a month ago it had the stock ATI video card. It would only do this behavior every once in a while. 2 6 core processors + 24GB of corsair vengance ram + 2 SSDs mirrored for the boot drives and 3 3TB drives striped together and had not been updated for a couple of years.

When it was behaving, I managed to get the firmware updated to the latest included with Mojave.

No change - it would on occasion do the power on for 5 seconds and then just power off.

I had purchased an Aero MSI RX 560. On mini-dp the color was all off but I went and picked up a monitor that had regular display port on it. Card worked when using display port. This was with high sierra. But the OS was an upgraded copy since 2012 and was from work. Lots of old adobe stuff and stuff for peripherals long gone.

So I put the old ATI in, pulled all the drives and installed a 1T SSD I had around. made a bootable 10.13.x USB on my other mac. Managed to get that install done. Swapped the stock ATI with the Aero and now:
I cannot get video no matter what card is installed.
The only time it stays powered on is if I:
hold power button for 6 seconds while plugging it in and then powering it up while holding D down
hold D down when powering on

Otherwise it powers on and then shuts off.

Did removal of ram and swapping 8GBs out at a time to make sure the behavior didn't change. It didn't change...

I've tried different kbd/mouse also.

Any ideas?
 
I took the macpro to the apple store at the MOA. A seasoned pair of techs and I and went over the behavior.

It would boot into diagnostics they have onsite and it passed the ram tests. After going over everything our conclusion is that it's the backplane which is bad.

Time to disassemble and figure out what the cost of that backplane part is... Ugh
 
imerdan

If you have the 4gb Aero MSI RX 560 how are you powering it ?

I'm not familiar with the RX 560 but does it have a 6 pin power connector ?

If so, which cable are you using?
 
MIKX said:
imerdan

If you have the 4gb Aero MSI RX 560 how are you powering it ?

I'm not familiar with the RX 560 but does it have a 6 pin power connector ?

If so, which cable are you using?
Click to expand...

It is the same as the 2gb versions I have there is no additional power required it all comes from the pci-e slot. Too bad it looks like backplane rather than buy it probably better off buying used machine. I would think it would be close to the same cost and you get a duplicate of every part spare.
 
To first answer the question of power, this is the 2GB RX560 card with no aux power input.

For video cables, I've tried every permutation on both cards using 4 different monitors... DVI, miniDP, HDMI and DP. The funny thing was the RX560 with HDMI would always give washed out color. I then tested the vid card and HDMI on a PC, and it was fine. So that was a really weird thing. But then when the machine was working if I used the RX560 with DP, the color was fine.
 
lmerdan said:
washed out color
Click to expand...
sounds like the display is set to reduced range, check in the options if it's set to 'TV' mode or something for HDMI, tv's use something like 15-245 instead of the full 0-255 (thats of my head so i may be a tad of, think it's 15 minus at the top/bottom of the range)
 
ugh - replaced backplane and that was not the problem. The systems still gives zero video and powers off after a touch.
 
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