By "single board", do you mean with the CPU in socket A only or do you mean with a Mac that has a single socket?
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2009 Mac Pro 5,1 both CPUs work in slot A but no boot screen with both
- Thread starter smiller777
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By "single board", do you mean with the CPU in socket A only or do you mean with a Mac that has a single socket?
My recommendation from post #15:
If it does then I would consider installing the x5690 CPUs in pairs. Unfortunately this could result in having to do it three times (something like CPU X and Y, if that doesn't work than X and Z, and if that doesn't work than Y and Z). Unless you know someone else with a dual 4,1 to test on.
Unless you know one of the three CPUs is bad (the one you sliced some of the components on) then you'll have to get additional CPUs. Is it possible to exchange the CPUs with the seller?
No need to count the turns when using delidded CPUs— just tighten down until the screws stop. I recommend a 2-pass, criss-cross pattern, first pass using about 7-8 "twists" of the wrist, then the remaining 5-10 twists on the 2nd pass until tight.
On a recent build for 2 clients' dual processor MP4,1s, I actually bought a single-CPU tray for testing the replacement CPUs *before* delidding them (since the single-CPU configs have IHS). They are pretty inexpensive, compared to the rest of the machine and X5690s...got one for around $70. This way I could be sure I didn't get a bad CPU, then delid it, install, then wonder if I damaged it when delidding or installing. So, in order to help your process here, you might want to think about that little extra investment to help you get it right...if you wind up needing add'l X5690s OR want to try tsialex's technique of reattaching IHS for testing.
Hello, I am having a same issue on both Mac Pros. They were just fine for over 2 years without any issues. Recently, I tried to mess with open core, Radeon 580 w/metal for Mojave, and USB 3.0 pcie on one of my good running 5.1, 3.46Ghz. One night, I tried to open up logic pro and some sampling error made the screen to freezed, so I had to shut it down. And then it wouldn't boot anymore, so I pulled 3.33 tray from another mac pro and it was successfully rebooted. So again I open up logic pro and same error happened and wouldn't reboot just like 3.46 tray. So I thought somehow all CPUs were fried. Stupidly, I did same to on my other Mac Pro, result were the same, error from Logic pro they all dead. A day later, I installed 2.66 on both trays, and they all work just fine. I was very confused and want to find out what is going on. So I tried to install all of the 3.33 and 3.46 cpu individually just on CPU A slot, strangely they all boot and work as one cpu with 4 slots of RAM. When I did same test individually on CPU B slot, boot screen stuck on apple logo, and all fan spin at max speed. Now I really puzzled.
When I have to diagnose a dual CPU Mac Pro with similar problems, I always start installing a known working single CPU tray and test everything to be absolutely sure that the Mac Pro is working perfectly and the problems are located with just the dual CPU tray.
First thing is to remove all cards, all disks, do a 3-times consecutively clear NVRAM and boot a disk with a known working completely vanilla install of a MP5,1 supported macOS release, then run AHT/ASD. Only after all the tests are done, you look at the CPU tray.
After getting sure that you have a working Mac Pro, you have to track what is causing the CPU tray problems, some times all the weirdness is because you caused socket pin damage when you changed the CPUs. Look at the socket with strong illumination from very different angles using a magnification glass. It's extremely difficult, but not impossible, to re-align the socket pins. If it's not the socket pin damage, then you can't do anything else yourself and it's time to get a replacement tray or try to find someone that can diagnose and repair it.
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Thank you, I clear NVRAM 3 times with working tray the pair of 2.66, but I skipped the AHT/ASD cause I don't have one (I might have to dig around attic). It fixed the one stubborn ram slot, but still not booting when both 3.46 CPU sockets are on the tray. And again I tested CPU A still boots both 3.46 individually. Yes, I checked all the pins and they all looking good. What else could it be?
You download and learn how to install AHT here:
github.com
GitHub - upekkha/AppleHardwareTest: Apple Hardware Test Download Links
Apple Hardware Test Download Links. Contribute to upekkha/AppleHardwareTest development by creating an account on GitHub.
github.com
I will try it, thank you.You download and learn how to install AHT here:
GitHub - upekkha/AppleHardwareTest: Apple Hardware Test Download Links
Apple Hardware Test Download Links. Contribute to upekkha/AppleHardwareTest development by creating an account on GitHub.
Tested with pair of 2.66 both trays, all passed on both MacPros. Install 3.46 none of them boot. Could that be Boot Rom version 144.0.0.0? This was the last update I did on both MacPros before this happen.
The only chance of the BootROM be causing this is if you someway damaged the BootROM during the upgrade process, corrupting the microcode area. Since it's working with the original Xeons, I doubt that is being caused by the BootROM.
I am really appreciated your help. Now I am thinking to get logic board on ebay and see that would turn things around. If not, definitely the trays are not upgradable, well not anymore.
You can always backup/dump the SPI flash contents with ROMTool, save it securely, then use ROMTool to flash the generic MP51.fd from 10.14.6 full installer:
Code:
Install\ macOS\ Mojave/Install\ macOS\ Mojave.app/Contents/Resources/Firmware/MP51.fdIt's enough for boot your Mac Pro, diagnose it but not for iCloud/iMessage/FaceTime login, so use it for diagnostics purposes only and after your tests, you flash the original dump back.
Mojave was installed but, some of my old programs not loading, so downgrade it back to High Sirera.
I'm honestly falling to see what you downgrading to HighSierra has anything to it. If you deleted the 10.14.6 installer, just get it again from the Mac App Store, then use Pacifist to extract the generic firmware upgrade image.
ROMTool password is "rom", but if you don't know how to use it or completely understand the process, please don't even try.