Question about Intel D915GAG Motherboard

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My computer doesn't power-up

Last week, my computer didn't power-up inmediately, it could take at least 5 minutes. Two days after, the PC turned on 30 minutes after pressing the power switch. When the pc was turn off and the AC plug wasn't removed, the PC starts inmediately after pressing the power switch.
I changed the battery which keeps the BIOS information but the problem didn't dissapear.

Now, my computer doesn't power-up via the power switch.

I have also disconected several devices (DVD, RW, HDD,...) but the problem don't dissapear. The led on the Motherboard is lighting but the pc doesn't start after pressing the power switch. The power switch is ok.

The pc starts ok when I establish a short between the green wire of Power Supply (PS_ON#) and COM (black wire).

I have observed continuity between the COM wire and chassis via the Mobo's fixation screws. The same occurs between the Power Supply black wires (COM) and its own chassis (isolated of the other components), but it is isolated from the external AC power (phase, neutre and earth).

I haven't tried avoid this continuity yet because these washers look designed for this purpose (not plain, shake proof washer or serrated).
They are on a ground plain. The manufacturer could have left without cupper the washer area in order to avoid it. I suppose that it could be in order to avoid noise.

---> Is this continuity normal? Do you have continuity between these points (COM and chassis)?

---> Are the Power Supply and Mobo damaged? Any capacitor? What else could be causing this?

Thanks in advance.

Posted by on

  • javier_libre Jan 10, 2009

    My comp is a PIV 1.8Ghz, ATX Power Supply Unit.



    I have tried booting with no ram but the comp doesn't power up. No beep occurs. The led on the mobo is lighting but the green led on the front pannel is off.



    The voltage on the PS_ON# wire is TTL high level despite pressing the power switch.

  • dragon_rag27
    dragon_rag27 May 11, 2010

    what is the age of the comp?

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Sounds like motherboard or cpu have given up ,try booting with no ram checking for beeps,vga etc

Posted on Jan 09, 2009

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