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  1. #1
    ROG Guru: Yellow Belt Array F0x135 PC Specs
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    MotherboardROG Strix Z370-F
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    Z370-F Power on from cold boot doesn't enter POST

    Hi all,

    This happens 1 out of every 5 boot, usually from cold. I have to force a shutdown and boot again for it to go into post.

    I have attached a speaker to hear the beeps codes to the z370-F when i first built it. When the issue happens, all the RGB turns on, and i can see heatsink fan start spinning (air cooling).

    HOWEVER, the exhaust fan DOESN'T SPIN, and there is no beep(s) coming from the motherboard speaker. This is when it doesn't enter post.

    Any ideas what could be causing this? Is the motherboard not getting enough juice from first cold boot?

  2. #2
    ROG Guru: Brown Belt Array davemon50 PC Specs
    davemon50 PC Specs
    Laptop (Model)Asus G752VY-DH72 (17") and Asus G752VT-DH74 (17")
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    Can you confirm you have a good solid connection from the heatsink fan to your CPU fan header?
    Davemon50

  3. #3
    ROG Guru: Yellow Belt Array F0x135 PC Specs
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    MotherboardROG Strix Z370-F
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    Quote Originally Posted by davemon50 View Post
    Can you confirm you have a good solid connection from the heatsink fan to your CPU fan header?
    Yep, the heatsink + fan is on tight.

    I fail to see how that possibly affect this though? The heatsink fan is the only one that spins when it goes into this state (of not going into POST). It's the rear exhaust fan that doesn't spin, plus the lack of a beep from the speaker, that lets me know the system won't go into POST.

    Thinking about this now, could my OC setting (minor: 4.7) be affecting this power on issue from cold boot? Something LLC maybe?

  4. #4
    ROG Guru: Brown Belt Array NemesisChild PC Specs
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    Quote Originally Posted by F0x135 View Post
    Yep, the heatsink + fan is on tight.

    I fail to see how that possibly affect this though? The heatsink fan is the only one that spins when it goes into this state (of not going into POST). It's the rear exhaust fan that doesn't spin, plus the lack of a beep from the speaker, that lets me know the system won't go into POST.

    Thinking about this now, could my OC setting (minor: 4.7) be affecting this power on issue from cold boot? Something LLC maybe?
    Return all bios settings to default and see if it still happens.
    Intel i7 8700K@ 5.2GHz (Delidded)
    ASUS Maximus X Hero (Bios 1801)
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  5. #5
    ROG Guru: Brown Belt Array davemon50 PC Specs
    davemon50 PC Specs
    Laptop (Model)Asus G752VY-DH72 (17") and Asus G752VT-DH74 (17")
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    Quote Originally Posted by F0x135 View Post
    Yep, the heatsink + fan is on tight.

    I fail to see how that possibly affect this though? ...
    Because you missed the point of my question, which was CPU fan header connection. That it's not a different location, and the solidity of that particular header connection. Your response was regarding the fan and heatsink, which is important but not what I was asking. May not be that at all, but is what I was asking about.
    Davemon50

  6. #6
    ROG Guru: Yellow Belt Array F0x135 PC Specs
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    MotherboardROG Strix Z370-F
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    Quote Originally Posted by davemon50 View Post
    Because you missed the point of my question, which was CPU fan header connection. That it's not a different location, and the solidity of that particular header connection. Your response was regarding the fan and heatsink, which is important but not what I was asking. May not be that at all, but is what I was asking about.
    Apologies, my response wasn't clear. Yes the connection to the CPU FAN HEADER is on secure and tight. But yes, i still fail to see even if that was loose how i would prevent the system from entering POST.

  7. #7
    ROG Guru: Yellow Belt Array F0x135 PC Specs
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    MotherboardROG Strix Z370-F
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    Quote Originally Posted by davemon50 View Post
    Because you missed the point of my question, which was CPU fan header connection. That it's not a different location, and the solidity of that particular header connection. Your response was regarding the fan and heatsink, which is important but not what I was asking. May not be that at all, but is what I was asking about.
    I thought of this too when i suspected the OC settings. Will reset the CMOS this weekend and see.

  8. #8
    ROG Guru: Yellow Belt Array F0x135 PC Specs
    F0x135 PC Specs
    MotherboardROG Strix Z370-F
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    I've reset the CMOS and even updated the bios to 0616.

    Happened again this morning. :/

    Everything is at stock now and i'm out of ideas to what's caused it so suddenly. Do i have to reseat everything? Why doe it happen only on cold boots?

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