Where do I plug in the power sw and power led wire on the eMachines T5274 computer? Thanks

There is no specific wiring for eMachine. your wiring goes from power supply (big box with fan) to motherboard (large board with many components) to hard drive, cd rom, fan, etc. pretty easy to figure out if you look closely

There should be 2 rows of pins in parallel usually around the bottom edge of the motherboard. The markings for which is which should be next to them on the board. HDled+, HdLed-, PwrSw, PwrLed, or something similar.

If you do find them but the hard drive Led does'nt come on it's because the plug for it needs to be turned around the opposite way, Led's only work one way as they are diodes. Same for the Power Led.

If there are no letters near the pins then you would have to find the motherboard manual.

If you look closely at the board there should be labels printed. The power switch plug can plug in either direction, but the LED must be the correct direction for it to work. No damage can be done by plugging the LED in backwards.

Here is the diagram for your connection. It may vary but most probably there are names are written on the mother board for the connections



Thanks.

The eMachines T5274 uses an ECS 945GCT-M3 motherboard.

This is ECS Support, and the download page for the motherboard manual,

http://www.ecs.com.tw/ECSWebSite/Product/Product_Detail.aspx?DetailID=719&CategoryID=1&MenuID=16&LanID=0

To the right of the Download Site heading, (At the bottom), left-click on the country nearest yours.

This is a PDF file download. Takes a few seconds to see the first page come up, and additional time for the file to fully download.

After the file has fully downloaded, go to Page 11.
(The PDF file page number box at the top, next to the blue Down Arrow, will show 11)

In the motherboard photo shown, the number 12 points to Panel1.

This is the Front Panel header.
(The Front Panel is the plastic front of your computer. This particular connector is referred to as a Header)

Barring you cannot download the motherboard manual, I will explain in detail as I go along.

Orient the motherboard in your mind, so that we are both looking at it in the same direction.

Processor to the top, Ram Memory slots to the right, Panel1, (Front Panel header), is at the bottom Right corner, and is along the edge of the motherboard.

Page 33.
There are 2 rows of pins. One row along the top, one row along the bottom.

4 pins along the top, 5 pins along the bottom.

The Bottom row of pins are numbered Odd.
The numbering starts from the Left side of the motherboard, and goes towards the Right.

The Top row of pins are numbered Evenly.
Numbering starts from the Left side of the motherboard, and goes towards the Right.

Top row numbering of pins, starting from the Left side, going towards the Right,
2, 4, 6, 8, and 10. There is No pin 10. Just a flat spot.

Bottom row numbering of pins, starting from the Left side, going towards the Right,
1, 3, 5, 7, and 9

Page 33.

A) Pins 1 and 3 are for the HarDDrive activity LED light.

Hard Disk LED (+) The Positive wire of the HDD LED light goes to Pin 1.
The Negative wire of the HDD LED light goes to Pin 3.
More than likely if the wires are marked, only the Positive ( + ) wire will be marked. Usually with a little tag that has + symbol on it.

B) Pins 5 and 7 are for the Reset switch.
IF, a reset switch is offered on your eMachines.

Pin 7 is for the Positive wire. (+)
(It isn't necessary to have a Reset switch. It's a restart switch. Used to restart your computer, and there are many other options available)

C) Pin 9 is reserved, and not used.

D) Pins 2 and 4 are for the Power On LED light.
Pin 2 is for the Positive wire. (+)
(If the two wires are reversed, the Power On LED light will be dim)

E) Pins 6 and 8 are for the Power On switch.
Pin 6 is for the Positive wire (+)

Have any questions regarding this, post in a Comment.

their should be some abrevations like pwr led, pwr sw, hdd led by some metal pins in one of the corner of the motherboard

The manual for your computer is available from emachines, p.168 shows the info you need (replacing the front I/O panel)
http://downloads.emachines.com/userguides/8511279_eM_NG3_chassis_HW_ref_en.pdf

The good news is that you can't harm the computer by connecting the wires wrong and the bad news is they just won't work the way they are supposed too if not connected properly. The LED's must have the correct polarity to work.
In general, if you look real close (as in magnifying glass and flash light) you will see the ID for each set of pins is printed on the motherboard (pwr,rst,HDD,pwr sw,speaker) Just match what it says on the motherboard to what it says on the wires. Don't worry if you get the polarity wrong. If a light doesn't work just swap the two wires. The colored wires should be positve (+), though. The reset (rst) and power switch (pwr sw) wires don't require polarity.
These instructions are for most computers in general, YMMV.

There are may motherboards, but most have writing on them as to what is suppose to plug where. For example, for the power switch, the lettering might be "Pwr" or "Power" or "Pwr sw". The pins are usually together and should fit the plug on the end of the wire.

check on the motherboard there should be a small prints on it near control panel.

I hope it helps!!!