929-Fatal MCA Error detected CPU 0

[halfstone]

I have a new (refurbished) Z620 with a Quadro M4000 8gb, 32 gb RAM, Windows 10.  The processor is an Intel Xeon E5-2680@2.7 GHz, 8 Cores. 

The BIOS is HP J61 v3.90, 6/1/2016. 

I noticed that when I left the computer for a while, I'd come back to find a black screen with this error: 

929 Fatal MCA Error; MLC Error Detected CPU 0.  Internal timeout error Watchdog Timer (3 strike). 

Reading about what this could possibly be is a little scary; got all set to run memory diagnostics and re-seat the proc (or send it back under warranty), but I noticed that the crash only happened when I left for a while.  

I checked the power settings, and saw that "Sleep" mode was enabled, timed for 30 minutes or so of no activity.  I changed this to 5 minutes and hung out a while, and it crashed with the same message.  I changed it to "Never", and it has been on ever since (two days and counting).  

In my case, I don't think it is a hardware error at all.  I did run some memory diagnostics (Windows) and found no errors.  I will boot from a USB and run MemTest overnight to be sure - but I think the hardware is fine. 

From what I have read, this is sometimes a problem of power reaching the CPU or the RAM; if it happens when the computer goes to sleep, that'd make sense. 

I never use these automatic sleep settings anyway, so it's not really an issue except that it's wrong and it bugs me - anyone have any thoughts about it?  

If my MemTest shows errors, that's that - if not, I will pull chips and test with the 5-minute sleep test.  I think it's a BIOS setting - would love to hear from someone with more experience than I.  

[SantiagoCamargo]

Watchdog Timer (5 strike) is default.

I solved a similar error re installing windows 7 professional

HDD configuration in AHCI

[BeeBop1865]

I am having a similar problem with a Z820.

I am running on high power settings, with all of the sleep/hibernate functions  disabled (I think, unless they hid one somewhere odd).

My computer has failed after hours every day for the last two weeks with the:

929-Fatal MCA Error

   MLC Error Detected CPU 0.

I am running Windows 8.1 Enterprise and I do think that the error developed after connecting the device to the internet briefly.  Does anyone have any suggestions on how to fix this besides keeping it from sleeping, which I think I already have done without solving this problem?

Thanks!

[TeVeN]

Hi

I received this error when I installed Windows 10 pro workstation, but in Windows 7 I have no problems.

But I want to install Windows 10 because of this message and I have not found a solution to it yet.
If you can, please help resolve this widespread problem because I saw in my queries that many people have this problem.

best regards

[Azza-OZ]

Hi Danny 

I have the same issue with the z840 running E52690v4 CPU's. I have heard that you must turn off Halt C1 settings under Advance - Power. Our CPU have a new Power saving mode if the system has no work it might shutdown 12 of 14 cores. At this point the

firmware code counts the core shutdowns for power down and enter C1 power state. Doh !

How long have these Processors  been around for now ?

More importantly how long until they are fixed. 

I think the hanging is cause by the WIN 10 install of the ME upgrade. It must change settings in the Bios. I know if I change Run Time Power Manager to Enable I see an option to then configure Turbo mode. Which I had not seen available before. 

[DGroves]

this error is usually caused by either the CPU or RAM (borderline ram or mixed ram modules can cause this error)

if you feel qualified, you can also reseat the CPU

you might also try resetting the Bios "cmos" settings back to defaults

the quadro m400 card has onboard ECC ram for it's video menory but i've still seen them cause various system errors. if possible replace the card and see if you still get the 929 error

last resort, is to reinstall windows from scratch, and only install the MS updates and no other programs/utils and then check the sleep function