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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.
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
Hi, Usually the power on button only has two wires. Then you have HDD led leads, reset leads, power led leads etc. These are all separate wires that fit onto separate pins in the Jpanel1 (front panel header).
Could be that the really old emachines grouped all these wires and made them into a plug to fit their own style motherboards.
If this is the case then that connector would not be on your newer motherboard, and it would have that Jpanel1 instead.
Hope this helps as I'm not very familiar with the old emachines.
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.
I have not identified the specific components on the motherboard that blow, but I can tell you the defect in the Bestec supply. The +5 VSB, which is the voltage that is on at all times, loses regulation and climbs to 8-11 volts. I believe this "higher than the required" +5V takes out the components on the motherboard involved with the computer/power supply "turn-on" circuitry. The "on" button on the eMachines front panel no longer turns the motherboard on because the "kept alive when the main power is off circuits" - which allow the on/off button to do its job of turning on the machine - no longer work.
Test your Bestec power supply by plugging it in the wall socket and have it not connected to anything. Read the voltage between the purple wire and any black wire. If you see +5.0V, then this wasn't your problem. If, like it did on mine, is closer to between 8, and 11 V, this is what took out the motherboard.
If you feel comfortable working inside the computer, after taking electrostatic precautions and ensuring the power is off and disconnected, look for a group of colored wires which plug on to a set of pins near one corner of your motherboard. The power wires should be marked "PWR" (or something similar) on the end of the wire, and the appropriate place for it on the motherboard should have the same marking.
If in doubt, take it back to who/where you got if from, and ask them to do it for you, or give us the eMachines model number and we can give more specific info on how to proceed.
Safety first. If you're the slightest bit unsure about what you're doing...DON'T DO IT!!!