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The wires should be labeled HDD,POWER, and i think RESET or somthing, just look on the motherboard within cord reach and you should see all three labeled on the motherboard all grouped together.
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L1 L2 L3 Neutral Earth North America Black Red Blue White Green
There is no blue cable in a 220V, so you have only; white, black, red and ground always green colored wire.
Looking your plug frontal side.
Green Ground on top (semi-circle)
black on left
red on right
white on bottom (neutral).
I've tested these timers. Here's what to do: 1) Connect green to bare copper 2) Switch has 2 wires. For now, connect these two wires to timer-black and timer-red. Choose either one. 3) In back of wall box are white neutral wires twisted together and covered with wire nut. Timer-white wire connects to these white neutral wires. This action gives power to time clock. 4) If wall box does not have white neutrals described above, then connect timer-white to bare ground wire. Bare ground connects to neutral busbar in breaker box. 5) Turn on power and click manual override button or switch. If lights turn on, timer is wired correctly. If lights do not turn on, then reverse timer-red and timer-black wires.
Green/wht normally = Reset or Power LED
Red/wht normally = HDD LED
And is the third red/BLACK?
There should be a label on the black pin jumper at the end of each wire.
Does it say anything?
Most Mobo's have printing next to the places that are jumpered or pluged into. The ones you need sould be close to the edge of the mobo, that is close to the front {power button} side.
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.
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
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