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It look that you have problems with the power supply.
Try to remove the power cable, and the press the power button for 10 seconds. Then connect the power cable again and try to power up finally.
If this doesn't work you should replace it with a working one, or take your pc desktop to a service center.
Theres no specific order for power supply wires. Just make sure it is disconnected from a power source and connect the Motherboard and optical drive cables to their respective plugs(plugs are standard for most motherboards).
Ok, test the power button pins. First disconnect any power source to the computer. Then, find the power pins on your motherboard (the one that your case's power button connects to. Usually two wires, one red and the other black). Grab a jumper a connect it to those two pins, they usually have the letters "pwr" or "power" printed next to them. Then, once you've done this, with the jumper connected, connect the power cord to your power supply. It should turn on by it self. If it does, then the problem is the power button. If it does not do it, then the problem is the motherboard. Good luck.
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.
sounds like an issue with your motherboard or something like that...try resetting the motherboard by unplugging the power, taking out the battery of the motherboard inside the computer and pressing the power button several times to drain the power. then put the battery back in, plug in the power cord and try to start it up. if it doesnt work then ur gonna have to contact emachines because ur mobo is either defective or broken...
I would recommend rechecking your connection to the motherboard. All wires from the power supply to board and making sure the front panel switch connection are correct. Also, make sure the power supply is compatible to the motherboare. even though a 20-Pin ps will connect to a 24-Pin board, it still does not work. Good Luck
If you can not see a "+" and "-" sigh on the connector as well as on the motherboard, then try it both ways. If you get it wrong the first time, it will not harm anything, just plug it in the other way if it does not work. Good luck!
You may have updated windows to a point that this old machine cant handle the revamp. Kick back to an older ops system, although that poses security risks. Your motherboard may also have given up. Best advice - upgrade, and retire this machine to the recycle bin.
A quick google determined your emachines model w2040 is equipped with FIC motherboard AM37. Download the manual from http://www.fic.com.tw/support/motherboard/motherboard.aspx?model_id=107 You'll find the pinout info for your wiring on page 13. Most motherboards also have the pinouts silkscreened onto the board itself.