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Thread: M2-atx mystery

  1. #1
    Low Bitrate agentloveless's Avatar
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    M2-atx mystery

    My m2-atx seems to not be able to power the motherboard on/off. Everything is hooked up acording to the manual. If I pull the wires off J8 when the m2 is powered it will then start the motherboard and will shutoff after I reconect it. It almost seems like the "switch" is stuck inside the m2. So as I said before all wiring has been checked and I have the correct inputs check by a multimeter. Anyone have any ideas? This is the second one that has done this to me. I RMAed the first and now I am at a loss. Thanks.

  2. #2
    Constant Bitrate RawsonDR's Avatar
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    What ABCD jumper settings are you using?

    What happens if you leave J8 connected to your mobo's switch, but put a PC switch on J9 and manually start the mobo?

  3. #3
    Maximum Bitrate JimmyFitz's Avatar
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    I think it has to be powered up once from the ign input. Then the switch will work unless you have a hard off shutdown. See this thread:
    M1-ATX power on "feature" discovered
    ~Jimmy

  4. #4
    Constant Bitrate ironic's Avatar
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    Question

    From where are you getting your power?
    Normal ATX psu from ur Home pc or ur 12v car battery?
    MSI KM4M-V Mobo -- AMD Athlon XP-M 1900+ -- 512MB DDR RAM -- LinITX 7" Touchscreen -- Seagate 8.4GB HDD -- LG DVDRW -- Onboard Graphics Card -- Onboard 5.1 surround sound -- Bluetooth Dongle -- RoyalTek Saphire GPS -- M2-ATX psu

  5. #5
    Maximum Bitrate JimmyFitz's Avatar
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    Quote Originally Posted by ironic
    From where are you getting your power?
    Normal ATX psu from ur Home pc or ur 12v car battery?
    It doesn't matter. Read the post I referenced again.

    M1-ATX power on "feature" discovered
    ~Jimmy

  6. #6
    Constant Bitrate ironic's Avatar
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    it does matter.

    it could be that your home atx psu is not capable of powering the m2atx.
    Thats what happenned to me.

    i decided to power it from the car battery and the sudden "shut off" problem ended.
    MSI KM4M-V Mobo -- AMD Athlon XP-M 1900+ -- 512MB DDR RAM -- LinITX 7" Touchscreen -- Seagate 8.4GB HDD -- LG DVDRW -- Onboard Graphics Card -- Onboard 5.1 surround sound -- Bluetooth Dongle -- RoyalTek Saphire GPS -- M2-ATX psu

  7. #7
    Low Bitrate Goofus's Avatar
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    I'm having exactly the same problem. My setup was working just fine on my desk with the M2-atx being powered by an AC psu. Then I had to go and knock the whole setup off the desk onto the floor. Yeah, pretty brilliant move.

    Anyway, now my system behaves like the power button is stuck being pressed. I turn on power to the M2-atx and the motherboard powers up for about 2 seconds then dies. The motherboard led stays lit though.

    If I disconnect J8, I can power the system up by jumping the motherboard switch with a screwdriver, and the system will remain running and operate normally. If I plug J8 back in, the system immediately shuts down (soft power down).

    The switch on J9 has no effect whether J8 is connected or not.

    Switching the jumpers on J10 (the delay switches) has no effect.

    If I use the screwdriver to jump the motherboard switch and leave it jumped, the system behaves the same way as if J8 is connected. It starts for about 2 seconds, then stops. Constantly holding the power switch down on a different computer gives the same behavior, so I'm pretty sure it's not a motherboard problem.

    Changing the polarity of the J8 plug didn't make any difference.

    Does anyone have any suggestions? I can't see any physical damage to the power supply, but I'm pretty sure something's wrong.

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