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Have an Intel D845-WN motherboard that won't power up. If I short power connector pin 14 (green) to ground it powers up as long as shorted. Checked power switch at MB connector, when pushed, it closes, when released opens. Unit was working OK until I connected both signal and power to floppy. Disconnected floppy still doesn't power up. Removed MB from case looked for defects in traces, solder, etc. couldn't track the traces very far though, and same with DMM audio continuity tester.

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  • anonzero Sep 07, 2008

    Same problem - board powers on for ~ 1 second, then shuts dow & wont restart. Power sypply? CPU? or MB?

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2 Answers

I turn on my pc but 1 second it off what happen please sagest

Posted on May 12, 2008

I want intel d845 motherboard sw

Posted on May 04, 2008

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1 Answer

Standby 5V overvoltage (8-9 volts instead of 5): what's probably damaged?


  • Check the voltage on the Power supply. (5V STB is on pin no. 9).
  • Check the voltage (on pin no. 9) from the back of the motherboard on ATX socket.
  • Check the voltages on the Front Panel connector for 3.3v, 5v and ground.
  • Check for shorting by placing one probe of multimeter on the ground and the other one by one in pin no. 1,2, 4, 6, 8,9,10,11,12,14,19,20 also on the CPU connector. If there is shorting the problem is with some component on the motherboard.
I think probably the Power Supply (SMPS) is faulty.

Hope that helps.

Oct 23, 2013 | Intel D925XECV2 Motherboard

2 Answers

I have tried running 2 different M4A79 deluxe motherboards with a corsair 650W power supply, phenom I X4 processor, and an nVidia 9800GT video card but neither of them will so much as turn on with...


It sounds like the ATX power supply is not getting turned on by the motherboard.
In order for this to happen, pin 14 (PS_ON*) of the 20-pin ATX power plug from the power supply must be pulled to ground. You can test this by plugging the power supply in to AC power without it plugged in to the motherboard.

Using a paper clip, short pin 14 (PS_ON*) to pin 15 (ground) and the power supply should turn ON.

Looking at the front of the 20-pin plug, with the latch on the top, pin 14 is the 4th from the left
__
_________________' '________________
' 11 ' 12 ' 13 ' 14 ' 15 ' 16 ' 17 ' 18 ' 19 ' 20 '
'--------------------------------------------------------------'
' 1 ' 2 ' 3 ' 4 ' 5 ' 6 ' 7 ' 8 ' 9 ' 10 '
---------------------------------------------------------------
Front of 20-pin ATX Power Connector

If you can turn on the power supply by shorting pin 14 to ground, but it doesn't happen when plugged into the motherboard, there is most likely a jumper setting on the motherboard which has not been configured correctly.

I hope this helps!

Mar 13, 2011 | ASUS M4A79 Deluxe Motherboard

1 Answer

I would like for someone to tell me what electrically happens when the power-on button on the front of my dell dimension 5100 computer is depressed to power on the machine. Specifically, what...


The ON/OFF button just "closes" an open circuit, e.g., just like a light-switch on the wall.

You could briefly even "short" the two pins on the motherboard front-panel, with a metal screwdriver, to prove that "closing" the circuit is the trigger to the motherboard to react, either by starting-up, or by shutting-down.

Aug 24, 2010 | Intel Motherboard

1 Answer

No power coming on intel desktop motherboard d845


Check the power supply to the motherboard i.e the SMPS, if it is working the fan of the SMPS will rotate. If the SMPS is ATX you can check it without connecting it to the motherboard. Unplug all the SMPS power connectors from the motherboard and then short circuit the green and the black wire of the 20pin connector of the smps, if the SMPS is working the fan of the SMPS will rotate. If the SMPS is in good condition and working, than it might be a problem in the internal circuit of the motherboard.

Check the process here:-
http://www.jestineyong.com/?p=267

Jul 19, 2010 | Intel D845GVSR Motherboard

1 Answer

Gateway T2838 with Intel 4000812 motherboard wouldn't power up. Replaced mother board and power supply. New components also won't power up. Both boards have green ready light lit on the board and both...


Check ALL your USB ports.. If any of the USB ports have shorted contacts or if the 5v rails are shorted to ground, the power supply WILL NOT switch on.. Also, if any of the items connected to the board have a supply rail grounded, again the board will not allow boot up. Unplug everything from the board and the drive power connectors too, except the power connector to the board and the front panel switches and try to switch on, if it still will not boot, check and recheck the USB ports and all power connectors, if it does, switch off and plug another item in, then switch on again. When you get to the item which prevents the board from switching on, thats where your problem lies. Dont forget, plug things back in one at a time, including the power plugs to the drives and try and power up between each item, and dont forget to power down after each item has been checked..

Mar 14, 2010 | Intel D845GVSR Motherboard

1 Answer

Computer will not turn on. Possible power surge.


If the power supply is good then your motherboard must have gone bad during a surge.

Dec 26, 2009 | Intel D865PERL Motherboard

1 Answer

Desktop won't start.


Try to replace the power supply with another known working power supply from another P4 desktop and then reconnect your wires from the front panel led lights, changing them around until they are in the correct position. I had an almost similar problem and I did the above, it is working now. All the best ! sirjohn

Oct 13, 2008 | Intel Desktop Board D845WN Motherboard

3 Answers

Motherboard not powering up


hi this is parveen

solutiom for d845gvsr not poweringup only led flashing--

short pin 92 and 93 of smsc LPC47M172 with fine tip soldering iron .
pin 92 is nrsmrst signal that is 3.3v at time of working m/b when this signal is low than motherboard not powering up so we short pin 93 that is standby (3.3v) and motherboard powering up again and working properly this problem doesn,t come again in future. this solution is 98% working 2% chances to change the chip.

Aug 07, 2008 | Intel Motherboard

1 Answer

How to connect front pannel


How about a picture? Pg. 46 in your manual.
Need manual, download from Intel. (Click on link).
http://www.intel.com/support/motherboards/desktop/RC440BX/sb/CS-013608.htm

0d7be67.jpg
Intel RC440BX Specification
Pg. 46
Basic rules case wiring. The color black is considered ground -. Power wires + can be any other color including stripped wires. (This is standard but case Mfg change to their own specification).

Pin 1 is + power for LED Hard drive green LED, Pin 2 is -/ground for Hard drive LED.
(Pin 3 is + power for LED Hard drive yellow LED, Pin 4 is -/ground for Hard drive LED).(See more options on pg. 47).
Pin 5 is + power for case On/off button, Pin 6 is -/ground On/off button.
Pin 7 is + power for Reset Switch, Pin 8 is -/ground for Reset Switch.
Once positive & negative pins has been located each connector follows in suit.

The Intel RC440BX front case connector is in an odd location.
The user will find it hard to connect front case LED connectors while the board in installed into the case.

Good Luck!

Mike

Apr 25, 2008 | Intel Desktop Board RC440BX...

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