MacPro mid-2010, Boot problem No chimes No display

[yzrec]

Hi every one,
Sorry to bother you guys with an other booting problem, after reading a lot of stuff, i didn’t find any solutions yet, maybe you can help.

configuration :
Mid 2010
6x3,33Ghz
Graphic card : GT120
10.10.5

Symptoms :
After an update of windows 10 on bootcamp, the mac turned off, for 10 minutes i could have the loading display of windows, then nothing.

By nothing i mean : When i press the power button.

- solid white light above the power button
- No chimes
- No display (not a black screen, i mean nothing)
- Graphic card fan are spinning
- MP fan are spinning to
- HDD seems to be rolling
- no power in usb connection

DIAG LIGHT :

Power OFF : 5V - Amber

POWER ON :
- Led PSU WORK : Green
- 5V : Amber
- EFI Done : Green
- GPU : Flashes Green.

No led error indication For the PSU or the RAM.

I've tried all the basic stuff, reset SMC, PVRAM, RTC. And some of the technical guide,
Booting in minimal config etc. I tried a second Flashed GPU, and second PSU same problem.
I don't really what to do next, or what to re-do in the right order.

I'd like to precise that the motherboard is brand New
I've got two set of CPU Trails (6x3,33Ghz, and 12x2,9GHZ, it didn't solve the problem)

If anyone had a similar problem or know what the flash green GPU Led means.

Thank you
Paul

 

[thornslack]

What is your hard drive/ssd configuration? Sounds like windows buggered itself

 

[yzrec]

What is your hard drive/ssd configuration? Sounds like windows buggered itself

I've got a 250b SSD (Mac os) on bay 1 and an 1ToHDD with the windows parition on bay 4 , is that what you're asking ?
The thing is usualy when there is a problem with windows, there's no problem to start on Mac on the SSD. Now i can't boot both of them

 

[Synchro3]

Could be an incident that in your Mac Pro a Northbridge heatsink rivet just broke?

The symptoms you described above look exactly like that (no chimes, fans spinning). Maybe it has nothing to do with your Windows installation.

 

[yzrec]

Could be an incident that in your Mac Pro a Northbridge heatsink rivet just broke?

The symptoms you described above look exactly like that (no chimes, fans spinning). Maybe it has nothing to do with your Windows installation.

Yes , i'feel that it has nothing to do with Windows, more a hardware stuff , how can I verify that it's broke?
Thanks

 

[thornslack]

Could be. Have you tried booting the system w/o the bootcamp drive installed?

 

[Synchro3]

Remove the CPU coolers, if a northbrige heatsink rivet is broken it looks like that (happened to me): https://forums.macrumors.com/thread...ng-broken-northbridge-heatsink-rivet.2046462/

Example:


You need to reapply thermal paste when you install the coolers again.

 

[yzrec]

Could be. Have you tried booting the system w/o the bootcamp drive installed?

Yes , nothing changed , I'm guessing since there's no chime, and not the right diag led sequence , the mb don't boot any of the disk
[doublepost=1503340588][/doublepost]

Remove the CPU coolers, if a northbrige heatsink rivet is broken it looks like that (happened to me): https://forums.macrumors.com/thread...ng-broken-northbridge-heatsink-rivet.2046462/

Example:
View attachment 713746

You need to reapply thermal paste when you install the coolers

Remove the CPU coolers, if a northbrige heatsink rivet is broken it looks like that (happened to me): https://forums.macrumors.com/thread...ng-broken-northbridge-heatsink-rivet.2046462/

Example:
View attachment 713746

You need to reapply thermal paste when you install the coolers again.

 

[h9826790]

I am also thinking may be the NB's problem.

Anyway, did you try replace the logicboard's battery yet?

 

[yzrec]

I am also thinking may be the NB's problem.

Anyway, did you try replace the logicboard's battery yet?

When i think about it, i got two CPU trails and they were both working, so it's seems unlikely that the NB of each CPU of each CPU trail went wrong at the same time, no ?

No i haven't try that yet.
[doublepost=1503344253][/doublepost]UPDATE :
I tried to change the GPU by a working HD5770, same problem.
The GT120 is not the problem, and is working perfectly on an other Macpro. Maybe it's GPU related, but not because of the GPU itself

 

[cjp76]

I had a very similar circumstance on my mac pro 5,1, something was wrong with my bootcamp and nothing I tried would get my mac pro to boot into the OSX partition. Windows was dead... computer up... but no display.

In the end, I inserted my mac pro's original install CD and rebooted while holding 'C', from here I could get to the terminal and manually set my startup drive to the Mac HD via the bless command (for some reason my PCie SSD that holds my Mac HD) was not appearing in the 'Startup Disk' section).

The root of my issue was not gracefully closing Windows via a Parallels session - it had corrupted my bootcamp partition...

Worth a shot if you have the original install DVD's that came with your mac?

 

[Synchro3]

I had a very similar circumstance on my mac pro 5,1, something was wrong with my bootcamp and nothing I tried would get my mac pro to boot into the OSX partition. Windows was dead... computer up... but no display.

In the end, I inserted my mac pro's original install CD and rebooted while holding 'C', from here I could get to the terminal and manually set my startup drive to the Mac HD via the bless command (for some reason my PCie SSD that holds my Mac HD) was not appearing in the 'Startup Disk' section).

The root of my issue was not gracefully closing Windows via a Parallels session - it had corrupted my bootcamp partition...

Worth a shot if you have the original install DVD's that came with your mac?

The OP's Mac Pro has no start chime, meaning does not even boot.
[doublepost=1503392982][/doublepost]

When i think about it, i got two CPU trails and they were both working, so it's seems unlikely that the NB of each CPU of each CPU trail went wrong at the same time, no ?

There is only one Northbridge, also on dual CPU board:

 

[h9826790]

The OP's Mac Pro has no start chime, meaning does not even boot.
[doublepost=1503392982][/doublepost]

There is only one Northbridge, also on dual CPU board:
View attachment 713857

I guess he means that he has 2 CPU trays. If both doesn't work, then the chance of having CPU, Tray, NB problem is significantly lower than other parts.

 

[yzrec]

Ok, si i checked the NorthBridge of each CPU trails and everything is fine !

 

[pdafan]

How about disconnecting the 2 internal drives (Your Mac and Windows) and connect an external bootable SSD with MacOS installed and see if it boots up nicely?

 

[yzrec]

How about disconnecting the 2 internal drives (Your Mac and Windows) and connect an external bootable SSD with MacOS installed and see if it boots up nicely?

Sadly i don't have an other external Ssd with a bootable macos on it to try that, but no external Hd launch because there isn't power in the usb port, i tried with the optical drive and an installation disc, still no luck. I'm gonna try again the external os this afternoon. Because if it's a Boot ROM Failure, that could solve it, i guess. Keep you guys update, thanks a lot for all the suggestions and the help.

 

[h9826790]

For no chimes, I doubt if an external drive can make any difference. The system can't POST, it doesn't reach the point that to search for boot drive yet.

If that works. Then remove all HDD and boot from a disc should also work

 

[Squuiid]

Have you changed the RAM yet? My money is on bad RAM. Try each stick individually perhaps?
I've seen cMPs not power on, or post, with bad RAM.