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Clear CMOS on a Pegatron M2N78-LA motherboard

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Belec Posted messages 29 Status Member -  
Belec Posted messages 29 Status Member -
Hello,
My PC, a HP a6720fr, is equipped with a Pégatron M2N78-LA motherboard.
On startup, the screen only displays a page with the keys
F9: Diagnostics, F10: Configuration, F11: Reinstall, and Esc: Boot Menu
I would like to perform a CMOS clear, but I can't find a jumper to move on the motherboard.
Only a lithium battery is present, and according to the HP documentation, it is used for the clock.
So how do I perform this CMOS clear?
Thank you for your responses
Configuration: Windows Vista / Internet Explorer 7.0

8 answers

  1.
    poupougne13 Posted messages 43203 Registration date   Status Member Last intervention   11 050
     
    Good evening...

    Remove the CR2032 for 20 minutes; it will have the same effect as changing the jumper, which may not be present on all motherboards!
    Best regards,

    @>+

    PS: Indeed, this battery also serves to keep the BIOS time; you’ll just have to put it back... be careful with the battery orientation, usually the + side is visible!

    --
    "He who wants to climb a mountain begins at the bottom!"
    Signed: "Gillette" alias "nobody"! ;) (°!°)
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  2. Belec Posted messages 29 Status Member 1
     
    Hello,
    Thank you, sweetheart, I will give it a try.
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  3. poupougne13 Posted messages 43203 Registration date   Status Member Last intervention   11 050
     
    Trying it is adopting it! ;)

    See you!

    --
    "He who wants to climb a mountain starts from the bottom!"
    Signed: "Gillette" a.k.a "nobody"! ;) (°!°)
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  4. pico.l Posted messages 24942 Registration date   Status Moderator, Security Contributor Last intervention   2 503
     
    Hello,

    I can't find a knight to move on the motherboard

    Look here >>> http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01638022&cc=fr&dlc=fr&lc=fr&jumpid=reg_R1002_FRFR#N1518

    See you!
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    1. Belec Posted messages 29 Status Member 1
       
      Hello Pico
      thank you for your input, I did indeed find the jumpers "clear cmos" and "cmos ....."
      but I had already followed the procedure from poupoune, which, by the way, led to nothing.
      So I'm still looking.
      See you later.
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  6. poupougne13 Posted messages 43203 Registration date   Status Member Last intervention   11 050
     
    It is true that the jumper exists (except for modifications, as it may be the case...[sic]) but usually, the inscription is "clear cmos"... "cmos pw"... I believe I have never seen it, but oh well....

    Best regards,

    @+

    PS: in any case, removing the battery is worth the jumper movement!
    --
    "Who wants to climb a mountain starts from the bottom!"
    Signed: "Gillette" a.k.a. "nobody"! ;) (°!°)
    0
    1. Belec Posted messages 29 Status Member 1
       
      Hello poupoune,
      Thank you for your reply if you're reading this.
      The "clear cmos" and "cmos pw" jumpers do exist
      but not next to the battery. They are located at the top left under the DVD drive.
      But I removed the battery for 20 minutes as you told me and I still have the same problem.
      I’m still looking.
      See you later.
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      1. poupougne13 Posted messages 43203 Registration date   Status Member Last intervention   11 050 > Belec Posted messages 29 Status Member
         
        Well, it seems that clearing the CMOS is not enough...

        Try disconnecting your CD, DVD, and floppy disk drives, check that you don't have any cards in the drives, and see what happens at startup...

        Talk to you later

        --
        "Who wants to climb a mountain starts from the bottom!"
        Signed: "Gillette" a.k.a. "nobody"! ;) (°!°)
        0
      2. Belec Posted messages 29 Status Member 1 > poupougne13 Posted messages 43203 Registration date   Status Member Last intervention  
         
        I've already done that. I left only the keyboard, the screen, the mouse, and the power cable on the PC
        as recommended by HP (lol).
        But tell me, does the CMOS reconfiguration (or something like that) happen by itself afterwards?
        Actually, I'm afraid of going too far and "messing" everything up.
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      3. poupougne13 Posted messages 43203 Registration date   Status Member Last intervention   11 050 > Belec Posted messages 29 Status Member
         
        Don't worry, the BIOS resets itself as soon as you restart.. you can optionally enter it and set the default values, then confirm by saving....

        See you later


        --
        "Who wants to climb a mountain starts from the bottom!"
        Signed: "Gillette" aka "nobody"! ;) (°!°)
        0
  7. pico.l Posted messages 24942 Registration date   Status Moderator, Security Contributor Last intervention   2 503
     
    I answered based on the edited sentence ;)

    PS: On certain PC models, the method of removing the battery is not recommended and generally the method of moving the jumper is advised in the manuals: tip
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  8. pico.l Posted messages 24942 Registration date   Status Moderator, Security Contributor Last intervention   2 503
     
    Hi,

    Do what "poupougne13" suggested ( post 8 ) and also unplug the external devices.
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  9. Belec Posted messages 29 Status Member 1
     
    Thank you both, Poupougne and Pico
    I think the PC is going to end up at a repair shop. What pains me
    is that it's only 1 year and 8 days old. It broke down 2 days after
    the warranty expired, and at the large store where I bought it
    the tech support service isn't available locally. I only received
    a hotline number, where I ended up with a voicemail that, after
    I provided my password (which is on the invoice), simply told me that it was no longer valid. No way to talk!
    The customer is no longer the "KING" but a consumer.
    See you later.
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