The eMachines E4904 desktop computer uses an Intel D102GGC2 motherboard.
This is Intel Support, and the download page for the motherboard manual, for the Intel D102GGC2 motherboard,http://www.intel.com/support/motherboards/desktop/d102ggc2/sb/CS-022441.htm
On this page I would like you to left-click right on -
English Product Guide [PDF]
May take a few seconds before you see the first page, and additional time for the PDF file to fully download.
Suggest you let the file fully download before looking through it.
The computer you are using has Adobe Reader on it, which uses PDF files. If you do not have the latest version of Adobe Reader, 9.3.4., I would suggest downloading it. The new version will remove the old version.
This is the latest version of Adobe Reader download page,http://get.adobe.com/reader/
I would uncheck the McAfee Security Scan Plus. Just MHO ]
The plastic front of your computer is the Front Panel.
The area on the motherboard that the cables (Wires), from the Front Panel go to, is the Front Panel header.
(Series of pins sticking up from the motherboard)
In the top header of the PDF file is a Zoom Tool icon.
The + sign is the Zoom In tool icon.
The - sign is the Zoom Out tool icon.
I would click on the Zoom Out tool icon, and reduce the view to 100% (100 percent)
At the top of the PDF file in the header is also the page number box.
To the right of the blue Down Arrow.
Go to Page 11.
There are two ways to get to Page 11.
Click on the blue Down Arrow until you get to Page 11.
Put your mouse cursor in the page number box.
Press the Enter key.
Page 11 shows you an illustration of the motherboard.
Processor to the Top, Ram Memory slots to the Right, the Front Panel header is to the very bottom Right corner of the motherboard.
(R in the illustration points to the Front Panel header)
You can see that the Front Panel header consists of 2 rows of pins.
These 2 rows of pins run parallel to the outside edge of the motherboard.
Go to Page 38.
This page shows a color illustration of the Front Panel header, and where the cables (Wires) attach to.
There are Four pins on the Top row.
There are Five pins on the bottom row.
Processor to the Top, Ram Memory slots to the Right, the Top row of pins are numbered from the Left side of the motherboard, going towards the Right side.
Top row numbering going from the Left side of the motherboard, towards the Right side,
Pins 2, 4, 6, and 8.
Bottom row numbering going from the Left side of the motherboard, towards the Right side,
Pins 1, 3, 5, 7, and 9
1) Pins 1 and 3 are for the Harddrive Activity LED light.
Pin 1 is for the Positive wire. ( + )
2) Pins 5 and 7 are for the Reset switch, (Reset button), IF used.
3) Pins 2 and 4 are for the Power On LED light.
Pin 2 is for the Positive wire. ( + )
4) Pins 6 and 8 are for the Power On switch. (Power On button)
5) Pin 9 is for a 5 Volt wire.
Doubt it will be used.
Remember computer unplugged from power, AND observe Anti-Static Precautions BEFORE you reach inside your computer.
For any questions please post in a Comment.