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

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Trying to hook the motherboard back in

I unhooked the motherboard in my AMD emachines 3400 and I can't figure out whare the H.D.D. Light , Power SW , and power LED plugs go. Can you help?

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Re: Trying to hook the motherboard back in

It varys on each machine , but on the mother board their is a group of pins stickin out one or 2 have jumpers leave them alone! go to the pins left bare their is minenute abreviations next to the pins they will giv you an idea of what 2 do ,also look for colour coding.

Posted on Jan 17, 2008

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Re: Trying to hook the motherboard back in

Every socket and connector has a unique fit. your IDE(seatbelt hehe) will connect to your HDD or if its a SATA still it will connect to your HDD.

Posted on Jan 17, 2008

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Yes to both of your questions.
When nothing works, I first unhook everything from the motherboard except for the CPU, video, and memory. Then turn it on. If you get the fan starting up and video, then hook up the hard drive and keyboard and mouse to see if it works. Lastly, hook up the CD--this is the part that fails most often.

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The manual for your computer is available from emachines, p.168 shows the info you need (replacing the front I/O panel)

The good news is that you can't harm the computer by connecting the wires wrong and the bad news is they just won't work the way they are supposed too if not connected properly. The LED's must have the correct polarity to work.
In general, if you look real close (as in magnifying glass and flash light) you will see the ID for each set of pins is printed on the motherboard (pwr,rst,HDD,pwr sw,speaker) Just match what it says on the motherboard to what it says on the wires. Don't worry if you get the polarity wrong. If a light doesn't work just swap the two wires. The colored wires should be positve (+), though. The reset (rst) and power switch (pwr sw) wires don't require polarity.
These instructions are for most computers in general, YMMV.

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1 Answer


Hi there
The front panel connectors are mainly,
  • harddisk activity connector
  • power switch connector
  • reset switch connector
  • power LED connector
  • speakers connector
  • USB connector
Harddisk activity connector
This normally comes red in colour and is labeled as HDD-LED
Power switch connector
This comes green in colour and is labeled as POWER-SW
Reset switch connector
This usually comes grey in colour and is labeled as RST-SW
Power LED connector
This is usually green in colour and is labled as PWR-LED
Speakers connector
This speaker will give different beep sounds during boot to tell the user if there is any errors. It occupies 4 pins, however only 2 is important for the function. Be sure to connect the red coloured cable to the positive polarity and the black to the negative.
front_panel_connectors.jpg Front panel connectors pins on the motherboard
front_panel.jpg Front panel connectors from the casing

Good luck and thanks for using FixYa!!

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Thank you.........

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