Question about AMD eMachines Desktop System w/ 17'' CRT Display, 2.0 GHz Athlon 64 3000+ (W3400)

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I have emachine w3400 not powering . plz help

I have emachine w3400 and i have another emachine that wont power up. so i took the power supply from the w3400 and used it to power up the other emachine , than i put the power supply back to the w3400 and now it wont power up , i had removed the front penal form the w3400 so i lost where the 3 wires goes back on the pins , 3 wires one for power switch, hdd led, power led. you think these 3 wires making my computer not powering on, i plugged the power led and then i plugged the power supply the power led comes on , but non of the fans coming on. please help its crazy

Posted by acetx on

  • acetx Jul 10, 2009

    thanks , i got the problem solved, i had the power cable that comes from the front panel where the black and white wires that conects to the mother board . it was not connected in the right pins, there are 3 sets of wires that comes from the panel , Power switch wire, Power Lcd Light, and Hdd led light, i had them connected up right , but i kept trying diffrent ways tell , i finaly pluged the black and white wire on the mother board side ways on the top first 2 pens form the right . then i pluged in the power cord in the back , pushed the power button than here you go fans and pc booted right up. but now i still cant figer out where the other 2 set of wires for the hhd and power light go to make them light up. i tried to plug them every where but nothing happend. wired so i think the power switch and the cable must be connected in the right spot to make the machine works. ( now i have the other emachine T1840 that the power supply box is out and the power cable switch on the front panel broke off form the wire that connects to the mother boards. any one know where i might buy or find the power switch with the cable .... plz help thanks a lot



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I found this right on this website, hope it works!
As for the fans, make sure your connections are tight and in the proper sockets.

Posted on Jul 09, 2009


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1 Answer

W3400 service manual

A service manual for any eMachine will not be available. The best you will be able to get is a "user manual" which is next to useless for actually servicing a problem. eMachines are notorious for poor and non existent documentation.

Feb 18, 2014 | eMachines W3400 Motherboard Replacement...

1 Answer

How to hook up the face plate of a emachine w3400 Wich includes 3 wires 1 power butten and 2 led lights

Look at the pinout of the Front Panel header, of the eMachine W3400's motherboard.

The plastic front of the computer is the Front Panel.
The area of pins on the motherboard, that the cables (Wires) from the Front Panel connect to,
is the Front Panel header.

The motherboard for an eMachines W3400 desktop computer is an MSI ms-7145
(Micro Star International)

Orient the motherboard in your view so that we are both looking at it the same way.
Processor to the Top, Ram Memory slots to the Right, white PCI slots (3) to the Bottom.

JFP1 is the Front Panel header.
(Junction Front Panel 1)

JFP1 is on the Bottom Right corner. There are two columns of pins arranged vertically.
(The JFP1 header runs parallel to the Right side of the motherboard)

The Left side column of the JFP1 header is numbered Odd.
Starting at the Top and going Down, the pins are numbered;
1, 3, 5, 7, and 9

The Right side column is numbered Even.
Starting at the Top and going Down, the pins are numbered:
2, 4, 6, and 8.
There is NO Pin 10

A) Pins 1 and 3 are for the HarDDrive Activity LED light. (HDD)
If the LED light is dim will operating switch the wires around

B) Pins 5 and 7 are for the Reset switch. (Reset button)
> IF Used

C) Pin 9 is Not used. (NC. No Connection)

D) Pins 2 and 4 are for the Power On LED light (If dim switch the wires around)

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

Trace the wires back to the Power On switch. Even if it means temporarily removing part of the Front Panel to see.

Same with the LED lights.
See which wires go to the Power On LED, and HDD Activity LED. (Harddrive Activity LED)

Follow the 3 wires, and tell me where they go to on the Front Panel.
USB port?
Memory Card Reader?
Firewire port? (a1394)

Nov 27, 2010 | AMD eMachines Desktop System w/ 17'' CRT...

1 Answer


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:
This site will explain about the 24 pin connector from the power supply
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.

Apr 17, 2010 | E-Machines eMachines Desktop PC

1 Answer

Computer won't boot or shut off

Yep--you put it together incorrectly.
I don't know why you took it apart. Don't do that again. Just open the case and blow it out--especially the power supply. There is nothing to be gained by taking all the stuff out of it.

I would say you have the little plugs from the front panel in the wrong place. You don't have the power switch on the correct contacts. Your memory might not be seated fully. If you have a video card, it's not seated correctly.

The way to check where those little connectors it to look on the motherboard itself and printed near the little posts where you hook up the plugs. The posts should be labeled as to pwr sw, pwr led, rst, ide led, spkr.
Try that--and good luck. If you need further help, just post it here.

Jul 01, 2009 | E-Machines eMachines Desktop PC

1 Answer

2 emachines won't boot

Are you attaching them properly
if so then it is something other then power supply
something has caused both power supplies to blow
have you installed anything in the first emachine you talk about

Jan 17, 2009 | E-Machines eMachines Refurbished EMA...

1 Answer

Emachine W3400/ front panel connections

they have to be plugged in horizontally although it is possible to plug them in vertically because the pins are evenly spaced either way. they are color coded just not like you would expect for example one plug has a green wire and a white wire the green side goes to the green pin and the white side goes to a green pin with a white cross you have to look close because there are several green pins which is what threw me off do this with all three plugs

Apr 19, 2008 | AMD eMachines Desktop System w/ 17'' CRT...

3 Answers

My emachines wont turn on

also in addition to the above, try reseating the ram chips..take them out individually and plug them back into their respective slots..might be the miracle cure..If the motherboard fan turns on, it might just be bad memory..replace RAM chips

Feb 18, 2008 | E-Machines eMachines Desktop PC

1 Answer

Emachine W1135

when ur starting the tower and it light are on and ur fan there is no problem with the power supply, i think that u rily need a new motherboard because ur board will not boot on start up..

Oct 17, 2007 | AMD eMachines Desktop System w/ 17'' CRT...

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