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No pwer to my system until I pull the 12Volt 4 pin power connection to the Motherboard

I have an Intel BOXD945GNTL motherboard. There is no power until I pull the 12Volt 4 pin power connection from the Motherboard but I get no video and the DVD drives do not open. Is the Motherboard bad or the CPU chip? What does the 12Volt 4 pin power connector do anyway. Thanks, Rhytheman

Posted by Steve Lewis on

  • Steve Lewis Jul 02, 2007

    Thank you sir for youre knowledge. You are wonderful. I will first order a new CPU chip.


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As you say,the motherboard or the cpu may be the problem, as you need to connect the 4 pin connector as this is the independent 12v power supply for the cpu and not the ZIF socket like older cpu's. You may be getting power to the board when the cpu is not connected, but when it comes to the cpu taking over because the bios has not been checked, nothing else will run, including drives. If you do not get as far as the bios showing on the screen there is a good chance that the cmos chip is damaged on the board normally either from new or because of the board being stressed from flexing when fitting components to the board which is easily done unless the motherboard is supported by something underneath when attaching parts. If the board is already fitted into the chassis of the pc, remove it and double check that it is not shorting on the chassis of your tower.

Posted on Jul 02, 2007

  • Anonymous Jul 02, 2007

    If you need infoon your board click here to download the manual


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How to connect the power led,power sw,hdd led on e-machine t2240

Apologizes your question hasn't received a solution until now. I have been 'away from my desk' for a while.

The eMachines T2240 desktop pc uses an Intel D845GVSR motherboard.
So let's go to Intel Support for more information, and to the specific product download page for the Intel D845GVSR motherboard,

Intel Desktop Board D845GVSR Product Guides

On this page left-click right on the blue title -
Intel Desktop Board D845GVSR Product Guide (PDF)

This is a PDF file. The computer you are using has Adobe Reader on it which uses PDF files.
After you have downloaded the PDF file go to the top left and hover your mouse cursor on the rectangular icon. (To the left of the Up/Down arrows and Page: )

Hovering your mouse cursor over this icon will briefly reveal -
Toggle Sidebar. Click on this icon.
Now click on the icon to the immediate right of it. (Show Document Outline)

Scroll the Show Document Outline sidebar down until you see the heading - Connecting Internal Headers -
Now click on the heading immediately underneath it -
Connecting the- Front Panel Header -

[The front of your computer is the Front Panel. The area of connecting pins on the motherboard for the Front Panel is the Front Panel Header ]

On Page 11 in the Product Guide we see that S designates the Front Panel Header.
On Page 31 in the Product Guide it shows the Front Panel Header pinout. (The Front Panel Header is designated by C in the illustration)
Again on Page 32, it shows where the Front Panel cables connect to.

In case you are not able to view the Product Guide;

Viewing the motherboard installed in the computer case, the Front Panel Header lays parallel to the bottom of the motherboard, at the Bottom Right.

It is rectangular in shape and has 9 pins.
4 pins along the Top, and 5 pins along the Bottom.

The pins are numbered Even along the Top row;
Starting from the Left side of the Front Panel Header going to the right;
Pins 2, 4, 6,and 8. There is NO Pin 10.

The pins are numbered Odd along the Bottom row;
Starting from the Left going to the right;
Pins 1, 3, 5, 7, and 9.

A) Pins 1 and 3 are for the Harddrive Activity LED.
Pin 1 is for the Positive ( + ) wire. Pin 3 for the Ground wire.
In case the HDD LED is dim when the HarDDrive is active, switch the wires around. (Computer off and Anti-Static Precautions used)

B) Pins 5 and 7 are for the Reset switch, IF a Reset switch is used.
Pin 5 is for the Ground wire.

C) Pin 9 is for 5 volt ( + ) power. Not Used.
(Usually the motherboard manufacturer uses this pin to test the motherboard)

D) Pins 2 and 4 are for the Power On LED.
-> Believe Pin 2 is for the Positive ( + ) wire.
If PWR LED is dim when computer is on, switch the wires around.

E) Pins 6 and 8 are for the Power On switch.

There is No Pin 10.

For additional questions please post in a Comment.



Switch from amd to intel motherboard now have no power

No. Power-supplies are compatible with both Intel and non-Intel motherboards. Look near the Intel CPU for a 4-pin "power" connector -- if there is one, connect the cable from the power-supply into that socket.

When I turn on the power the processor fan does not start but when I disconnect the 12volt four pin power connector the processor fan start but no display in both the state. (865 GVHZboard, 2Ghz pro, 512...

The power supply connector might be not place properly. Check the connector in the motherboard there might be one missing that is not being connected the processor connector located near the processor itself...then check also the connector of the cooler might not be connected...
If all the things is in place but still the problem is exist. Replace your power supply with new...because there might be a defective component into your power supply which is not enough to supply the entire motherboard...

Diagram and pen out power supply and power switch placement emachine t3828

The eMachines T3828 Desktop PC uses an Intel D845GVSR motherboard.

1) Socket 478 processor socket

2) Comes with an Intel Celeron D 335 processor that uses a Socket 478 processor socket.

Celeron D 335 / part number RK80546RE072256

3) The motherboard chipset is an Intel 845GV
[The Northbridge chip is an Intel 82845GV, and the Southbridge chip is an Intel 82801DB { ICH4}
Intel 82845GV and Intel 82810DB are the part numbers on the chips]

Here is the motherboard manual you requested,

On this page click on the top file>
(Date 07/01/2003)
Go to the right and click on > Download

On the next page left-click on the empty circle to the left of>
I accept the terms in the license agreement

The file will automatically start downloading
Let the file download all the way before looking through it.

Connecting Internal Headers - Page 31 in the PDF file page number box at the top

You want C - Front Panel

The plastic front of your computer is the Front Panel
Cables (Wires) coming from the Front Panel go to the Front Panel header on the motherboard

Connecting the Front Panel is shown on Page 32

Processor to the Top, Ram Memory slots to the Right, the Front Panel header is at the Bottom Right. It is right along the bottom edge of the motherboard.

There are 4 pins across the Top
There are 5 pins across the Bottom
The Pins are numbered.

Starting on the Left side of the motherboard going towards the Right,
the Top row of pins are numbered 2, 4, 6, and 8

Starting on the Left side of the motherboard going towards the Right,
the Bottom row of pins are numbered 1, 3, 5, 7, and 9

A) Pins 1 and 3 are for the HarDDrive Activity LED light.
Pin 1 goes to the Positive ( + ) wire

Pin 2 goes to the Ground wire ( - )
If the LED is dim after installing switch the two wires around

B) Pins 5 and 7 are for the Reset switch. IF used. (Reset button)

C) Pin 9 is for the 5 Volts DC

D) Pins 2 and 4 are for the Power On LED light

E) Pins 6 and 8 are for the Power On switch. (Power On button)

Page 34 shows you where the power cables from the Power Supply go to the motherboard.
Connecting Hardware Control and Power Cables

D shows you where the 20-pin ATX main power cable goes.
Typical 20-pin ATX main power cable,

A shows you where the 4-pin +12 Volt power cable goes, (Power for the Processor),
Typical 4-pin +12 Volt power cable,

B is where a Chassis Fan connects to. (Computer case fan)

C is where the Processor Fan connects to

E is for another Chassis Fan

If you have further questions please post in a Comment.
Sorry it took so long to reply, I just saw this problem.

How to power connect to the mother board?

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The power jack is located on the motherboard. It is soldered to it. You have to remove the screws behind the laptop securing the back cover and disconnect the hard drive and GPU cables remove the keyboard so that you can pull out the motherboard. This is necessary since the solder joints are located under the motherboard and the jack is over it. There are 3 pins that are soldered. Remove the solder on all 3 and pull out the jack. Insert the pins of the new jack in the space vacated by the old pins and use a low diameter solder(2mm or less if available and lead free solder only) to solder the pins to the board and voila!

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You can get a quick guide from here

Best of luck

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Mb have power but not start...

Hi, good day sir, there are several things you should do first.
1. Disconnect all connections to the motherboard.
2. make sure that your Power Supply 4pin 12volt molex and 24 pin molex connectors are tightly plug.
3. Clean the memory port from any dust, plug the RAM module, make sure also the module connector is clean.
4. Plug in the speaker and power switch.
5. Connect a VGA monitor.
6. Reset bios/cmos or simply operate the pc without the battery.
7. Plug the Power Supply to AC mains.
8. test the PC.
9. do this several times if you cant start the PC.
10. if every thing is OK, reconnect your PC and peripherals one at a time.
Hope this helps.keep me inform about your progress. thanks
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