EMachines Power Switch

Are you sure it's not a power supply issue? You might get an LED that is lit on the motherboard, but that voltage is always on, unless you hit the back switch. You might not have the rest of the voltages. If the system was taking more than one push of the power button to turn on, the power supply is usually failing. If you can't find a manual at emachines, try the free Belarc Advisor that should id your motherboard make and model. http://www.belarc.com
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1) The eMachines T3626 uses an ESC MCP61SM-GM motherboard,

http://support.gateway.com/s//MOTHERBD/Shared/4006233R/4006233Rnv.shtml

Click on > Product Views

Now click on > P- Front Panel Connector

http://support.gateway.com/s/MOTHERBD/Shared/4006233R/4006233Rmvr18.shtml

Did you connect the cables, (Wires), from the Front Panel to the Front Panel Connector, correctly?

Looking at the Front Panel Connector, observe where it has > 2, at the bottom.
(Right above the small round object with the Orange dot in it)
This is the Bottom of the Front Panel Connector

The pins are in Two columns.
The column on the Right side is numbered > Even
The column on the Left side is numbered > Odd

Starting at the Bottom going Up on the Right side,
Pins 1, 3, 5, 7, and 9

Starting at the Bottom going Up on the Ledt side,
Pins 2, 4, 6, 8, and there is NO Pin 10.

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

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

C) Pin 9 is for the 5+ power

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

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

F) There is NO Pin 10

Let me know in a Comment.

this is most likely tye power supply which should be checked -should cure it.

After reading an article about Emachines awhile back, I found out the reason you can't find the schematic- it isn't available, as some motherboards are made specifically for Emachines and therefore not distributed, as they might normally be, but again, others are, but you have to identify them and go through another source to get them- Emachines, appartantly, will not supply them. All is not lost, however...all motherboards have, basically, the same hookups and connectors for the power supplies, hard drives, etc.- they are standard. I found a web blog that explains the power switch, reset, and power led, which will help. Here it is: http://www.computing.net/answers/hardware/emachine-power-sitch-wiring/56545.html
This site will explain about the 24 pin connector from the power supply
http://www.tomshardware.com/forum/53750-7-installation-manual-rs480m-w3400-emachine-motherboard
If you google "motherboard wiring" you will find sites that have illustrations of the motherboard, and explain which connectors go to which sockets, and how to identify them.
With a little patience and determination, you should be able to hook everything up from the various blogs on the net. Hope this helps.

hiya heres a good diagram for what you need


http://scienceaid.co.uk/physics/electricity/images/plug.png

hope it will help you

You may be dealing with bad or overheating with your processor or memory. If possible, try swapping out your memory chips to see if that does the trick. If not, you will have to try swapping out the processor (much less likely you'll be able to swing that).

you can checkit by unhooking it on the inside from the mobo panal just remember where it ogoes back take a small flat head and cross the two prongs it comes of off then shut it down if it works look on ebay for a complete front panel with switch or order from emachines.

If you are replacing the power supply and it has 4 pin 12v conector and your motherboard doesn't, just disregard the 4 pin plug. The 20 pin conector will supply sufficient power for the processor. Many of the older motherboards did not have a separate 12v supply for the processor.

I made this diagram, hope it helps!

Ok for a start the power switch is not green and white that is the power led, you need to look for a red and black wire normally marked on the connector and motherboard as pwrsw or pswitch.
if you believe it to be the switch unplug the connector and jump the connection on the motherboard using the reset switch or a jumper, or not recommended but have done this myself many times using a flat blade screw driver very carefully and touch the 2 pins to complete the circuit.
if it doesnt power on then its more than likely it is the power supply but the motherboard being faulty could also cause this to happen.
the problem i have found with emachines is that its difficult to get replacement power supplys