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Hot!New Z370 Classified K, i7-9900K build; bizarre POST

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jmack254
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2019/07/07 12:33:57 (permalink)
This is a brand new build - everything except the case is new.  I have not been able to complete a POST cycle.  Equipment list is below.  I've built all of my home systems since Intel came out with the 486, and this behavior is new for me.  Behavior is as follows:
 
1.  When I turn on the external power switch for the PSU, the system begins a POST.  This is true even with all front panel connectors disconnected, so the front panel power switch pins on the motherboard are not being jumped.  There is no video output.  Fans spin up.  Motherboard lights come on.  No drives are connected.  No cards are installed on the board. 
 
2.  POST codes display on the board.  After 10 seconds or so the POST code hangs at '18,' which comes back as "Pre-memory North Bridge initialization is started."  After 30 seconds or so of being hung at '18,' the system power cycles itself and repeats the process, hanging again at '18.'. 
 
3.  The on-board power button has no effect on any of this.  The on-board reset button causes the POST codes to restart at the beginning, from which they hang again at '18.'
 
4.  I have four DIMMS.  Results are the same with all four, or with any two in slots 2 and 4. If someone would like me to try with one stick, please let me know which slot it should be in. 
 
Equipment (all new, so all is suspect).  Nothing has been modified except larger fan on cooler:
 
Z370 Classified K.  Hardware rev is 1.0.  BIOS version is unknown.
i7-9900K processor. 
EVGA Supernova 650w G2 PSU.
Two kits of Crucial CT2K16G4DFD824A RAM.  Each kit is 2x16GB. 
Noctua NH-L9x65 cooler.  Stock fan has been replaced with Noctua NF-A9, which has higher airlflow.
Case is an old Lian-Li aluminum mini tower, but nothing from the case is connected to the motherboard.  It's just a frame holding the parts.
 
Guidance would be appreciated.
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    bcavnaugh
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/07 12:47:37 (permalink)
    Unsupported CPU, most likely being a New Motherboard.
    https://www.evga.com/support/motherboard/
    1.08 is needed to support the Core™ i9 9900K or higher.
    Insure that you have completed Product Registration for your motherboard.
    You will then need to open a Service Ticket on your motherboard requesting a new Bios Chip if available.
    Crucial CT2K16G4DFD824A Memory is also not listed on the above link so it may or may not work.
    "This part is 100% compatible with Z370 Classified K" as shown on Crucial Website so you should be ok.
    Crucial 32GB Kit (2 x 16GB) DDR4-2400 UDIMM
     
    Or Call Customer Service @
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    post edited by bcavnaugh - 2019/07/07 13:58:09


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    Cool GTX
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/07 13:59:45 (permalink)
    Could be a defective 24-pin wire harness with your PSU.  (You only used the wire that came with the PSU ?)

    Test remove all PSU cables except the 24Pin -  Disconnected on MB end ---> when you apply Power does the PSU start ?  If yes, that indicates the 24-pin wires have a bad ground that is acting like a start signal

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    jmack254
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/07 14:33:06 (permalink)
    bcavanaugh,
     
    I will do that.  Thank you.  I was ready for some sort of "unsupported CPU" message on POST, given that the hardware rev on the board is 1.0 (predating BIOS 1.08, I think), but this behavior of starting to POST without the board power pins being jumped is unexpected.
     
    Cool GTX,
     
    Just to be explicit about what is connected:  the only connections between the PSU and the board are the 24 pin and the separate 8 pin for CPU.  Both wires and connectors were the ones provided with the PSU.  In the time we've had separate power connections for CPUs I've never tried to start a system without that connection made.  I'm not going to damage anything by trying to start without it, am I?
     
    Thank you both. 
    #4
    Cool GTX
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/07 14:46:41 (permalink)
    No, it will not damage anything
     
    With Only the 24-pin cable connected to the PSU & the 120V power cord to the wall plate - Your Only testing to see if the PSU starts - On its Own = bad 24-pin wire harness
     
    The MB is Not even connected to the PSU or Anything else.

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    MhzManiac
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/07 16:26:44 (permalink)
    One possibility is a bios option could be set to auto boot after a power failure. Whens it hangs up and you cut power to the power supply itself, it will attempt to re-boot automatically. Having the older bios is not allowing you to enter the bios to change things, so it becomes a vicious circle. Holding down the power button before it hangs should get the system to shut down normally if it is not a hardware fault problem.

     
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    jmack254
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/08 20:15:20 (permalink)
    Cool GTX  - Thanks for the clarification.  On first read I thought you wanted the 24 pin connected to the motherboard but not the 8 pin.  As it turns out, with both disconnected from the motherboard, no, the PSU does not start when I move its onboard switch to 'on.'  This is true with just the 24 pin harness connected to the PSU, and with others connected, as well.  I have to confess I was hoping you were right and that it would be that simple.
     
    bcavnaugh - Thanks for the suggestion.  I have registered the board and have opened a ticket asking if it's possible to send me a replacement BIOS chip.
     
    MhzManiac - I thought of auto-restart, too.  My first attempts to get it to shut down from the power button before it hangs have failed; I'll try more tomorrow.
     
    Given the value of time, if getting the BIOS chip can't be done quickly (or perhaps at all) I'm considering buying an 8th gen i3, putting it on this board, and if it boots, use it to upgrade the BIOS to 1.08 or above, then shelving the i3 until my next build.
     
    Thanks to all for your help.  It's appreciated.
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    Jc
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/09 15:54:32 (permalink)
    When I first bought my z370 classified the bios werent updated. I just sent it back to EVGA and they sent me a new one with updated bios. The down side to this is the fact that I have to wait about a week.
     
     
    Welcome to the club! :)
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    jmack254
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/10 18:59:43 (permalink)
    EVGA support has let me know that the BIOS chip itself can't be replaced on the Z370 Classified K, but they did offer to upgrade it and return to me at no charge, as they did for Jc.  Given the generally weird POST behavior I'm seeing, and the strong chance that I might have other hardware that's actually defective, I'm uncomfortable waiting a week or more.  I've ordered an 8th gen i5, which I will use to upgrade to current BIOS and then retry the build.  I knew ahead of time that the board might not come out of the box with the BIOS needed for the 9900K, so this is not really a big issue.
     
    Thanks to all for your help and suggestions.
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    bcavnaugh
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    Re: New Z370 Classified K, i7-9900K build; bizarre POST 2019/07/11 11:10:46 (permalink)
    jmack254
    EVGA support has let me know that the BIOS chip itself can't be replaced on the Z370 Classified K, but they did offer to upgrade it and return to me at no charge, as they did for Jc.  Given the generally weird POST behavior I'm seeing, and the strong chance that I might have other hardware that's actually defective, I'm uncomfortable waiting a week or more.  I've ordered an 8th gen i5, which I will use to upgrade to current BIOS and then retry the build.  I knew ahead of time that the board might not come out of the box with the BIOS needed for the 9900K, so this is not really a big issue.
     
    Thanks to all for your help and suggestions.

     EVGA Support still has it


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