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Hot!EVGA Z370 FTW cold boot bug?

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Neutro
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2021/11/14 22:35:06 (permalink)
Hey guys,
 
Since winter and temperatures dropped i'm having a "cold boot" bug situation.
 
When i start my PC in the morning on the first boot my screen stays black, no uefi/bios screen displayed. Motherboard LED displays shows "3B" which translates to "Post-Memory South Bridge initialization is started" according to the MB manual and 2 red leds are lighted:
 
 - PCIe LED for PCI-E 2. According to MB manual: "The LED will remain on when this PCIe slot detects an initialization failure in PCI-E 2."
 - PCIe LED for PCI-E 4. According to MB manual: "The LED will remain on when this PCIe slot detects an initialization failure in PCI-E 4."
 
In my PCIE 2 port my graphic card is plugged, in the PCI-E 4 there is nothing.
 
BUT! If i just let the computer like this for like 1 min, turn it off then back again the PC boots normally. If i then turn the PC off or just reboot it, it works perfectly. It only has this problem after staying off for a long time when i go to sleep. Dunno if cold temperatures in the morning play a role in this or not, but it seems it started to do this since winter came and temperatures dropped.
 
I didn't change anything before this happend, my CPU is a 9900k which i have put back to stock settings in case o/c was the problem but it didn't solve the problem. Also MB is running the latest bios.
 
Any idea?
 
Thanks in advance for your help :)

I do not work for EVGA - I just try to provide help on my spare time :)
 
If you require official support from EVGA please visit EVGA Service Center 
 
i9 9900k / EVGA Z370 FTW / EVGA 3070 XC3 Ultra
 

 
#1

6 Replies Related Threads

    Neutro
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    Re: EVGA Z370 FTW cold boot bug? 2021/11/15 12:26:52 (permalink)
    Update from today: same problem but different POST codes. I had to restart 3 times to get the PC to boot. The motherboard would hang onto these codes:
     
     - 62 : Installation of the South Bridge Runtime Services
     - 79 : CSM initialization
     - 96 : PCI Bus Assign Resources
     
    Looks kinda random. I've tried disabling fast boot yesterday in the bios but didn't change anything sadly.

    I do not work for EVGA - I just try to provide help on my spare time :)
     
    If you require official support from EVGA please visit EVGA Service Center 
     
    i9 9900k / EVGA Z370 FTW / EVGA 3070 XC3 Ultra
     

     
    #2
    cotter32
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    Re: EVGA Z370 FTW cold boot bug? 2021/11/24 22:40:33 (permalink)
     
    Since no one is answering, and those peculiar malfunctions led me to ruminate a bit, I offer the following five
    lunatic theories in descending order of madness :|
     
    1. Mooninites are reprogramming your CPU while you sleep .
    2. The cold, then hot is causing your MB to flex slightly, and has made one of your cards work loose in its slot .
    3. The cold computer, then warm air when you get up causes a little condensation on the circuit boards and pins .
        Just enough to make tiny shorts, and unwanted grounds .  Once it dries out it's back to normal .
    4. You have a delaminating circuit board, or capacitor .  Once warm the delamination closes and it's back to normal .
        If that's the case, then the component will continue to degrade, and ultimately fail :(
    5. You have a weak CMOS battery, and the cold stops it from working altogether, goofing up the BIOS .
     
    ... as seen from Mons Ampère
     
    #3
    dgspider
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    Re: EVGA Z370 FTW cold boot bug? 2021/12/12 15:45:07 (permalink)
    hi i have a EVGA Z370 Classified K, 134-KS-E379-KR, LGA 1151
    but was having almost the same problem
    switched two second bios and fixed my concern 
    tried two flash my primary but it didn't help I'm still on the secondary. 

     ~CPU:> Intel i7 8700k @3.70          
    ~CPU COOLER:> Noctua nh d14s
    ~MOBO:> EVGA z370  Classified K
        ~GRAPHICS :> EVGA RTX 2080 SUPER FTW3 ULTRA 
       ~RAM:> gSKILL TridentZ Series 16GB (2 x 8GB)   3200
    ~HD:> 960 pro 512g 
      ~PSU:> EVGA SuperNOVA 850 P2
     ~MONITOR:> 23" asus 1920x1080 and acer 16" 1366x768  
     ~INPUT:> Logitech G15 Keyboard and Logitech 502 mouse   
        ~O/S:> win10 (64) "pro"   
     
    Affiliate  : CVLX5QGGI0
     Heatware: http://www.heatware.com/u/106038
     

           
    #4
    cotter32
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    Re: EVGA Z370 FTW cold boot bug? 2021/12/26 16:02:26 (permalink)
     
    Dear Mr. spider;
    If you can reach your BIOS switch while the computer is running:
    try the "hot flash method" https://www.evga.com/support/faq/FAQdetails.aspx?faqid=59733 to fix your BIOS 1 .
    It worked for me, and I have the same board you do .
     
    To the Moon ..
     
    #5
    Neutro
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    Re: EVGA Z370 FTW cold boot bug? 2022/06/19 04:16:27 (permalink)
    Long update after: the problem was coming from my RAM. Strangely it worked without any problems for a long time using XMP until finally it didnt.
     
    I removed XMP, setup the RAM manually and no more problems.

    I do not work for EVGA - I just try to provide help on my spare time :)
     
    If you require official support from EVGA please visit EVGA Service Center 
     
    i9 9900k / EVGA Z370 FTW / EVGA 3070 XC3 Ultra
     

     
    #6
    rjohnson11
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    Re: EVGA Z370 FTW cold boot bug? 2022/07/04 02:07:21 (permalink)
    Neutro
    Long update after: the problem was coming from my RAM. Strangely it worked without any problems for a long time using XMP until finally it didnt.
     
    I removed XMP, setup the RAM manually and no more problems.


    Good troubleshooting. 

    AMD Ryzen 9 5950X,  Corsair Mp600 Pro M.2, 128GB DDR4  Crosshair VIII Hero, RTX 3090ti FTW Ultra Associate Code: H5U80QBH6BH0AXF. I am NOT an employee of EVGA

    #7
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