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X79 classified will not post if PSU turned off/power disconnected - CMOS reset fixes.

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simarills
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2014/12/28 12:23:22 (permalink)
Hello all,
 
I have a weird issue in that my new Build runs like a charm, but if the PSU is turned off or the wall power cut, then the next time I turn it back on the system will power on but not POST.
 
Hitting the clear CMOS button resolves it but I would prefer to not do this every time the computer is moved etc. 
 
I have replaced the PSU as part of my troubleshooting process, unfortunately this did not resolve it.
 
I have an X79 classified with 16GB Corsair Dominator RAM running 2133 XMP profile, 3930k (not overclocked at this point) dual Asus 780's and a new Enermax 1000w PSU.
 
Has anyone else had a similar issue or can you provide any insite into what might be causing this?
 
thanks in advance.
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    bcavnaugh
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    Re: X79 classified will not post if PSU turned off/power disconnected - CMOS reset fixes. 2014/12/28 13:01:31 (permalink)
    How is your CMOS Battery?
    Start testing with only One Memory Stick.

    Associate Code: 9E88QK5L7811G3H


     
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    simarills
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    Re: X79 classified will not post if PSU turned off/power disconnected - CMOS reset fixes. 2014/12/28 13:53:55 (permalink)
    bcavnaugh
    How is your CMOS Battery?
    Start testing with only One Memory Stick.




    Thanks for your reply, I will test the CMOS battery tonight (at work ATM) the board is brand new but I guess it could have been on the shelf for a while.
     
    If its not the Batt, I will test with only one memory stick, Although I hope the board is not that fussy!
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    _JoseR
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    Re: X79 classified will not post if PSU turned off/power disconnected - CMOS reset fixes. 2014/12/28 17:50:47 (permalink)
    If replacing the PSU and the  CMOS battery  does not work and you only have the mouse and keyboard plugged in and no other external components attached (i.e. USB, audio, ethernet ) and the problem persists then it is RMA time. Please feel free to contact us any time via support@evga.com. We are typically available 24/7 but we will not resume regular hours until after January 1st.

     
     
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    simarills
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    Re: X79 classified will not post if PSU turned off/power disconnected - CMOS reset fixes. 2014/12/28 21:35:53 (permalink)
    ok , updates: Replaced the CMOS battery - same issue, then Tried 1x stick of Memory - same issue
     
    Toggled the dual BIOS selection switch - now it will POST fine even after it was disconnected from mains power for a bit, so it looks like that particular BIOS was to blame.
     
     
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    bcavnaugh
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    Re: X79 classified will not post if PSU turned off/power disconnected - CMOS reset fixes. 2014/12/29 07:04:51 (permalink)
    I recommend that you now update all Three Bios Positions with the current Bios 2.07.
    10-21-2014 BIOS 2.07 151-SE-E779 Win8/Win7/Vista/XP  Download  View
    Both mine are at this version and it is a great Bios for the X79 Classified Motherboard.
    One is with the i7-3930K the other the i7-3970X
    post edited by bcavnaugh - 2014/12/29 07:15:24

    Associate Code: 9E88QK5L7811G3H


     
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    simarills
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    Re: X79 classified will not post if PSU turned off/power disconnected - CMOS reset fixes. 2014/12/29 13:10:48 (permalink)
    Thanks for the Info, I will definitely do that!
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