Question about E-Machines eMachines Desktop PC

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Tried new power supply but didn't help. (Who knows - maybe I didn't install correctly.) I first thought it was the power switch on front of machine. Was wondering if some easy test for power switch?

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  • JDTec
    JDTec May 11, 2010

    You need an multimeter to check the switch and the Power supply.

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  • E-Machines Master
  • 5,660 Answers

Tips from me:

1.If your power supply isn't coming on, I advise you to check the 20/24-pin motherboard power cable,
connector, and be sure it's down in tight. Make sure that lock tab of the power cable connector, snaps over the motherboard connector lug. Make sure that connector is in all the way.

2.Be sure the wires that come from the Power On switch, and go to the motherboard, are connected, and down all the way. The connector, or individual connectors, need to be down on those motherboard pins all the way. (The area on the motherboard where they connect, is called the Front Panel header. A connector on a motherboard is called a Header)
Also make sure both wires from the Power On switch, (Button), are connected to the motherboard, if the wires have individual connectors.

Now, how to test to see if the Power On switch is bad.

The 20/24-pin ATX motherboard power cable connector comes in three styles.
A.20-pin connector. Has two rows of 10 socket holes
B.24-pin connector. Has two rows of 12 socket holes
C.20-pin and a 4-pin connector.

NO matter what style it is, it has a Green wire going to that connector. The Green wire is the
Soft Power On wire.

With the motherboard power connector plugged into the motherboard, and the computer plugged into the surge protector, you need to jump that Soft Power On wire, to a Ground wire.
View these photos of a 20-pin ATX Main power cable. (Motherboard power cable, Main power cable.
Same/same)
http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Look at the photo all the way to the right. (You can save this page, and bring it up in a new window)
This shows that Green wire. Fourth one from the left.
Next to it is a Black wire. Fifth one from the left.

ANY Black wire is a Ground wire.

You need to make a jumper wire. This wire should have insulation on it. It should be as thick as those power cable wires. It should be about 3 inches long. You need to strip off 3/4ths of a inch of insulation, off of EACH end. Twist the exposed wires. Make a tight wrap. Bend this wire into a U-shape.

At this point you may want to don a protective rubber glove. Tightly fitting dishwashing glove, or perhaps a surgical style one. Reasoning is, that there will be a spark. You may feel more safe this way. I don't use one, but I'm an old tech, and maybe not too Tightly Wrapped! lol! (I also was a journeyman lineman, so this spark doesn't bother me!)

With the ATX motherboard power cable plugged into the motherboard, you are looking at the back of the connector. The wires go down into a socket. At the end of every wire is a metal terminal end.
It's pretty far down in there. One end of your jumper wire, goes down deep into the Green wire socket. It needs to touch that metal terminal end.

The other end of your jumper wire, needs to touch a Ground wire terminal end. ANY Black wire is a Ground wire. Just stick the end down into a socket with a Ground wire. Hold it there for about 1 to 2 seconds, bring the wire back out. You just want to make a Momentary Contact.
Your power supply should start.

If so, you have a bad Power On switch. If not, your problem is the power supply, or the motherboard.

Posted on Apr 20, 2009

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  • Contributor
  • 40 Answers

I'm assuming you press the power button and absolutely nothing happens?
you can purchase a pretty cheap power supply tester, but usually switching it with another one is the easiest way unless you do this type of thing often.  to be safe, just hook up the main connector to the motherboard and the additional 4 pin / 6 pin if it exists.  don't worry about hooking up your cd/dvd drive or hard drive yet.  if you have a video card and it has an additional power connection, it'll need to be plugged in, too, if you want to test for video.  now give it a shot.
if you are getting not fans moving, no leds on the front of your pc, your switch could be bad...probably not the psu if you changed it out unless it lacks the necessary hookups for your system.
often when i can't get video, the motherboard has gone bad...but sometimes a pci or agp card just needs to be reseated or even the memory.  good luck!

Posted on Apr 20, 2009

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  • Expert
  • 172 Answers

It is the classic motherboard problem, see my support pages at http://www.motherboardsrus.net and go to the emachine support page. Chris

Posted on Jun 05, 2009

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Posted on Jan 02, 2017

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Wait a minute. Won't boot, or the Power Supply doesn't start up?
Power Supply doesn't start up;

1) You have a bad ATX power on switch
2) You didn't connect the ATX power on switch to the correct pins, on the Front Panel header.
3) You have a bad Power Supply

http://www.directron.com/atxswitch.html

Computer doesn't boot up;
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http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

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5) Is this a replacement motherboard for a bad one?
SAME motherboard, or a different one?
Why?

Because when Windows is installed on a computer, (Harddrive, actually), it assigns hash values to certain major hardware components.

Components such as;
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2) Motherboard chipset
3) BIOS program, version, and date
4) Harddrive
5) Graphics chipset. (Whether Integrated Graphics, or a graphics card)

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[ Microsoft makes one Master disk. From it all GENUINE copies are made, and sold to the consumer ]

If you are lucky, the Windows activation screen may come up. Windows will want to be activated again. (Activated, not Registered)
Doesn't happen all the time, though.

Using a brand new genuine copy of Windows? Make sure you go into BIOS Setup, and in Boot Order, set the first boot device to CDROM.


The LED light on the motherboard indicates it HAS power.

Motherboard Manual for the Intel D945GCZ mobo. (MOtherBOard),

(GHz stands for GigaHertz.
Giga = approximately 1 Billion.
Hertz stands for Cycles per Second.
1GHz = approximately 1 Billion Cycles per Second.
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Plus, it isn't new. It is NOS. New Old Stock.
Means it could be a bad motherboard, even if it has never been used.

{Computer technology follows Moore's Law,

http://en.wikipedia.org/wiki/Moore%27s_law

What is new technology today may be old tomorrow }

http://www.intel.com/support/motherboards/desktop/d945gcz/sb/CS-020793.htm

Blue -> English Product Guide [PDF]

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2) When the cover is removed, the switch is closed. The wires are grounded out. Remove the switch. Cut the exposed bare wire off, leaving just the insulation. Put a wire nut on it. Do the same for the other wire.

For additional questions please post in a Comment.
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