We have been having problems with our Emachines e1331 model. Recently, the power supply stopped working and we replaced it. Only within about 4 hours of installing it, the keyboard and mouse stopped w It previously wouldn't boot and we replaced the power supply, because from what we've read, the ps's are funky on Emachines. When it seemed all was fine, the keyboard and mouse quit working. We restarted it and then it didn't boot like the brand-new ps was bad or something.

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03 Jul, 2012

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1) Check to see if you haven't accidentally bumped, your ram memory module/s loose. (Module = 'Stick')

When installing a new Power Supply this happens a lot.
Do not just visually inspect the ram memory module/s, take them out, and reinstall. This way you are ASSURED they/it are seated.

[Computer unplugged from power. Anti-Static Precautions FOLLOWED.
Handle the ram memory module by the BODY. The Body is everywhere on the ram memory module, except the gold plated contact pins on bottom,

http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpg

{Not the type of ram memory your computer uses. The above is just a genral example. The above is DDR Sdram with 184 gold plated contact pins. 92 on each side. Your computer uses DDR2 Sdram. 240 gold plated contact pins. 120 on each side. Also uses PC2-6400, or also known as DDR2 Sdram at 800MegaHertz }

The Body is coated with a see-through protective plastic ]

You may also want to clean the gold plated contact pins, with a pencil eraser, before reinstalling the ram memory module/s.
The gold plated contact pins develop a 'corrosion' on them. Doesn't take much to make a bad contact surface.

If you use an eraser on the end of a pencil, and not a solid eraser, refrain from letting the metal band touch the gold plated contact pins.
Rub up, and down on each contact pin. {Both sides} Doesn't take much to clean them.

When finished use air to remove the eraser dust. You can use a can of compressed air for computers if available, or air pressure from your mouth will be sufficient. If a can of compressed air for computers is available, use it, (And plastic straw), to clean out the ram memory slots, on the motherboard.

Didn't fix the problem?
Now for a long read. Get the coffee pot going.

2) eMachines are budget computers. Nothing wrong with that.

Computers designed to save the consumer money.

As such low quality power supply's were used. They also saved money by using low quality Electrolytic Capacitors, on the motherboard.

Problem is, this is one electronic component you don't want to scrimp on.

To combat Electrolytic Capacitor failure, motherboard manufacturers started using Solid Capacitors. Most design used are Solid Polymer Capacitors.

{A computer motherboard designer knows that Electrolytic Capacitors are bound to fail. The Electrolytic Paste inside the capacitor, breaks down over time, and usage. They use capacitors that are rated at twice the capacitance that is needed. This way when the capacitor breaks down to 50 percent, it is still at 100 percent of what is needed.

There was/is a capacitor plague, also. An Electrolytic paste formula was stolen, from a large reputable Electrolytic Capacitor manufacturer. Problem was the thief was given a bogus formula. It didn't have the necessary ingredients, to keep the paste from developing gas.
Thousands upon thousands of these capacitors were manufactured, and sold to many manufacturers of electronic components. Many motherboard manufacturers were the recipient of these capacitors. MANY motherboard manufacturers are out of business now, because of this,

http://en.wikipedia.org/wiki/Capacitor_Plague

http://en.wikipedia.org/wiki/List_of_motherboard_manufacturers#Motherboards }

According to my sources, this is the motherboard used in an eMachines E1331 Desktop PC,

http://www.ebay.com/itm/eMachines-EL1330-EL1331G-EL1333G-Motherboard-48-3V006-03M-08120-3M-DA061-8552-/350570369705?_trksid=p3284.m263&_trkparms=algo%3DSIC%26its%3DI%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D21%26pmod%3D270987994110%26ps%3D54

(Used for reference only, not advertising for seller, nor website)

If this is true, there are Solid Capacitors used for the motherboard voltage regulator circuit, and specifically one's used to regulate voltage for the Processor.

Looking at the photo look at the white rectangular block. This is the processor socket.
[Socket AM2,

http://en.wikipedia.org/wiki/Socket_AM2 ]

To the left of the processor socket in the motherboard link, are four silvery looking cylindrical objects. These are Solid Capacitors.
There are two more above the processor socket.

When these go bad they explode. ('Pop') Pretty easy to identify if one of these babies are bad.

The Electrolytic Capacitors on the motherboard, marked with a green plastic sleeve, or black plastic sleeve, will also show visual signs of failure,

http://www.capacitorlab.com/visible-failures/index.htm

To know what you are looking at, and looking for, allow me to post the basic construction of an Electrolytic Capacitor;

The Electrolytic Capacitors used, are Radial Aluminum Electrolytic Capacitors,

http://en.wikipedia.org/wiki/Electrolytic_capacitor

Click on the second photo down to the right, with the caption underneath -
Axial lead (top) and radial lead (bottom) electrolytic capacitors

Round cylindrical shape with a blue plastic sleeve, and two leads coming out of the bottom. (Lead - Think stiff wire)

Inside that blue sleeve is an aluminum 'can'. Just an aluminum open cylinder.
The top of the cylinder has a seal. A flat, thin, round disk. The disk has a shape etched partway into it. usually a lK or X.
This seal is called the Vent Cover.

The bottom also has a seal. It is a synthetic rubber, thin, flat disk, and is called the Bung.

Inside the cylinder are three strips.
1) One is an aluminum foil strip, and is called the Conducting Strip.
It has the Positive ( + ) lead attached to it.

2) One strip is also an aluminum foil strip, but has a non-conducting medium applied to it. It is the Non-Conducting Strip, and has the Negative ( - ) lead attached to it.

3) The last strip is composed of a paper-like substance, and is soaked with Electrolytic Paste.

The paper-like Electrolytic Paste strip is laid in-between the two metal strips, and all three are rolled up tightly.
{Basic construction. There are MANY metal, and paper-like soaked strips, paired together in an Electrolytic Capacitor }

The Conducting Strip's positive lead pokes through the Bung.
So does the Non-Conducting Strip's negative lead.

When the capacitor's paste inside starts to break down, it develops a gas. Hydrogen gas. The gas expands inside, and pushes the Electrolytic Paste out of the capacitor.

Breaks the lK, or X open at the top seal, (Vent Cover), and oozes out. Also around the edges of the round Vent Cover. And/or push one side of the Bung down, and ooze out.
(Capacitor is usually on a heavy lean. The Bung is touching the motherboard, and makes the capacitor lean over to one side)

So much paste loss, and the capacitor operates at a weakened state.
Too much paste loss, and the capacitor fails.

Capacitors on the motherboard are used as Filters, and Voltage Regulators.
The one's used as voltage regulators are in the motherboard voltage regulator circuit.

Part of what the motherboard voltage regulator circuit does, is to regulate voltage for the Processor.
The Processor MUST have a steady, 'clean', supply of voltage, AND it must be within the Processor's tight voltage range.

No Processor, no computer.

Although there are Solid Capacitors surrounding the processor socket, do not think that these capacitors are the only one's used, for regulating voltage for the Processor.

There may be some of those Electrolytic Capacitors used, on the motherboard in the voltage regulating circuit, for the Processor.
You have to follow the circuit traces on the motherboard, to see what all capacitors are used for the Processor.

[Circuit traces are also known as Signal traces. Think very fine flat copper wires, that go all over the motherboard ]

3) Could be a bad PSU. Happens.
RMA it back to the seller.

Summation;
1) Check the seating of the ram memory modules.
2) Check the Electrolytic Capacitors on the motherboard
3) Test the PSU, or have it tested, or send it back.

For additional questions please post in a Comment.
Regards,
joecoolvette
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