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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  • 85 Answers

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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Intel D945GZ motherboard? Got it. Now what the world are you talking about? A Chassis Intrusion Switch? What desktop computer is it in? Computer manufacturer name, and Model Number. Post back in a Comment.

Wait a minute. Won't boot, or the Power Supply doesn't start up?
Power Supply doesn't start up;

1) You have a bad ATX power on switch
2) You didn't connect the ATX power on switch to the correct pins, on the Front Panel header.
3) You have a bad Power Supply

http://www.directron.com/atxswitch.html

Computer doesn't boot up;
1) You didn't follow Anti-Static Precautions
2) You didn't apply Thermal Paste to the top of the Processor, before you put the Heatsink on.
3) You didn't connect the 4-pin ATX +12 Volt power cable.
Power for the Processor. (No processor, no computer)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

4) You didn't use the Installation Disk (CD) that came with the motherboard. (Has the DRIVERS)
5) Is this a replacement motherboard for a bad one?
SAME motherboard, or a different one?
Why?

Because when Windows is installed on a computer, (Harddrive, actually), it assigns hash values to certain major hardware components.

Components such as;
1) Processor
2) Motherboard chipset
3) BIOS program, version, and date
4) Harddrive
5) Graphics chipset. (Whether Integrated Graphics, or a graphics card)

Change any two of these components, and Windows will think it is being stolen.
Microsoft User's License states, "ONE Genuine copy of Windows per ONE computer "

[ Microsoft makes one Master disk. From it all GENUINE copies are made, and sold to the consumer ]

If you are lucky, the Windows activation screen may come up. Windows will want to be activated again. (Activated, not Registered)
Doesn't happen all the time, though.

Using a brand new genuine copy of Windows? Make sure you go into BIOS Setup, and in Boot Order, set the first boot device to CDROM.


The LED light on the motherboard indicates it HAS power.

Motherboard Manual for the Intel D945GCZ mobo. (MOtherBOard),

(GHz stands for GigaHertz.
Giga = approximately 1 Billion.
Hertz stands for Cycles per Second.
1GHz = approximately 1 Billion Cycles per Second.
It refers to Frequency Rate. For laymen frequency rate = 'Speed')

Plus, it isn't new. It is NOS. New Old Stock.
Means it could be a bad motherboard, even if it has never been used.

{Computer technology follows Moore's Law,

http://en.wikipedia.org/wiki/Moore%27s_law

What is new technology today may be old tomorrow }

http://www.intel.com/support/motherboards/desktop/d945gcz/sb/CS-020793.htm

Blue -> English Product Guide [PDF]

Let me know if you think there is a Chassis Intrusion Switch.
It will operate one of two ways;

1) When the cover is removed, the switch is open. No connection of the two wires is present. Remove the switch, put a piece of heat shrink tubing over one wire, and slide it back out of the way.

Twist the two wires together with an Electrician's knot, solder them, slide the heat shrink tubing over the connection, use heat to shrink the heat shrink tubing.

2) When the cover is removed, the switch is closed. The wires are grounded out. Remove the switch. Cut the exposed bare wire off, leaving just the insulation. Put a wire nut on it. Do the same for the other wire.

For additional questions please post in a Comment.
Regards,
joecoolvette

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