Question about E-Machines Bestec ATX-300-12E Rev. D 300w E-Machine GTW Power Supply Part 100929 (ATX30012E) Power Supply

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I have an emachine and it won't turn on.

How do I check the power supply. I have a gen light on inside the computer.

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  • Anonymous Dec 17, 2008

    i get no power what so ever . i have checked electrical outlets and cords associated with the tower

  • Anonymous Jan 07, 2009

    my hp computer wont turn on, a little light flashes on the bestec atx 300 power supply. what can i do?

  • jjohnmonahan Feb 17, 2009

    I have a Bestec ATX-300-12EB3 Rev: S2 power supply for my Gateway desktop that has just just gone to the Big Power Supply in the sky. As I have nothing to lose and much to gain, I am looking over the supplys circut board looking for the problem and find myself in need of the schematic for it would really help out alot, even if it's only to show the fuses location and voltage test points. Does anybody know where I could to find this puppy without having to sign up with every web site I go to looking for it? It seems to be a very common power supply, and I would think it's schematic would be as common.

    Thanks,

    John

    jjohnmonahan@aol.com

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You can get a power supply tester from Radio Shack for like $12. The systemboard is most likely the cause. not passing on the clear to power up command.

Posted on Dec 10, 2008

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Computer turns on, but screen says no signal


Computers send out a video signal.

If the monitor isn't receiving a video signal, you get No Signal on the monitor.

First thing to check is the monitor cable. Cable is used on another working computer to verify, or known working computer's monitor cable, is used in place of it.

I believe we can skip that.
Why?

eMachines are budget computers. Designed to save the consumer money, and give the consumer a decent computer.
Problem is low cost of computer, is due to certain hardware components inside the computer, are of low quality.

The Power Supply being one.
Dirty computer inside, also leads to early Power Supply demise.

You can;
1) Test the Power Supply with a multimeter. If you do not have access to one, economical models sell for around $5 to $12.
You will be testing three main voltages;
3.3 Volts, 5 Volts, and 12 Volts. All are DC Voltage.
In comparison two D cell flashlight batteries store 3 Volts DC.

[ Power Supply's are converters. They convert the dangerous high AC voltage (100 to 240. Depends on what country you're in), to the above low DC Voltages ]

Or do you have a KNOWN to be good, Compatible power supply; you can borrow from a working computer?

(I posted this one time, and the person posted back they had borrowed a Power Supply, from their aunt. Computer sat in the garage unused. When finished they returned the Power Supply. Put it back in the computer. Then went, and bought a new one )

Before performing the above, would like you to try this;

Unplug the computer from power. Press, and hold the Power On button in, for 10 seconds. Let go.
Do this same procedure two more times.
Continue also, until the Power On light doesn't briefly flash anymore.

Now plug the computer back into power. WAIT 1 minute.
Turn the computer on. The processor fan, computer case fan/s, and Power Supply fan; should race, (High idle speed), for a few seconds; then slow down. Let's see.

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

Also post the model number of the eMachines. Some examples, T1090, W3653, etc.

Nov 19, 2012 | E-Machines eMachines Desktop PC

3 Answers

I have a desktop PC that when I turn it on it will power up and then after 6 seconds turn back off.


The first solution is right on the money, It's the video card, or many of us today forget to plug the damm thing in and the computer doesn't read and we think that there is a serious problem. If none of this helps then try troubleshooting through this PC repair guide. Hope this helps.

Dec 29, 2011 | E-Machines eMachines Desktop PC

2 Answers

My computer won't boot up and the orange light just stays on. The moniter is working, the fans in the power supply is working


Could be your motherboard. Does anything come up on the screen at all when you boot up? Do you hear a beep at startup? Also check to make sure your hard drive is spinning just to be sure.

Dec 09, 2011 | E-Machines Computers & Internet

1 Answer

Have a e machine fan runs but connect monitor to another computer it works. smell a burning smell when turn on pc. Got it to come up once by unplug power hold on button 45 seconds plug in and turn on came...


The smell is the Power Supply.

Typical example of a Power Supply not installed in a desktop computer,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4435072&CatId=106

[ NOTE*
This is not an example of a direct replacement Power Supply for your computer. I would need to know the Model Number of your eMachines to give exact information ]

Bad Power Supply. Weak voltage power rail. (Or rails. There are three main voltage power rails for a Power Supply used in an eMachines desktop computer)

Enough power to light LED lights, and apparently spin fans, but Not enough to turn the Processor on.

Watts = Voltage times Amperage.
One measurement used for measuring the maximum available power output, of a desktop Power Supply, (SMPS. Switched-Mode Power Supply), is to state the Maximum Wattage available.

Typical maximum Wattage available for a typical eMachines Power Supply, usually averages from 150 to 300Watts.

1) ALL of the LED lights on at one time, will use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use 51 to 125 Watts of power.
Depends on what Processor it is.

(Note* Intel Pentium II processors use less than 51 Watts)

Solution is to replace the Power Supply.
This isn't as hard as it 'sounds', if you have never performed this procedure before.
I know you can do it.

1) http://www.fonerbooks.com/r_power.htm

2) http://www.videojug.com/film/how-to-install-or-change-my-computers-power-supply

3) http://computer.howstuffworks.com/power-supply.htm

If you need guidance in replacing the Power Supply in a step by step for your eMachines, please post in a Comment. (Believe upper right of your page)

Should you also desire recommendations to compare for a Power Supply, I would be happy to provide them.

Regards,
joecoolvette

Dec 01, 2010 | E-Machines eMachines Desktop PC

1 Answer

Emachine total black , this are on fan


LED lights are on? Fans spin? I suggest you have a bad Power Supply.

1) eMachines are noted to have low quality Power Supply's.
Saves eMachines money so they can sell budget computers.

2) A bad Power Supply is one of the leading causes of computer failure. I have, (Had actually), a shop half full of computers with this 'ailment'.

Some caused by the owners never cleaned out the inside of their computer, nor the inside of the Power Supply, with a can of compressed air for computers on a regular basis as needed.

3 to 5 years without cleaning the inside of their computer.
Mice could have made nests inside easily, with the 'Gunk' that was there. A bald eagle could have too. Rant off.

Others, caused by the computer manufacturer used a low quality Power Supply.
Low quality components used inside.
One of the major components that fails, is caused by a particular Electrolytic Capacitor that is used.

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

3) Power Supply's used in PC's are a type of SMPS.
(Personal Computer. Statement holds true no matter what type of personal computer it is)

[ SMPS = Switched-Mode Power Supply
PSU = Power Supply Unit
All terms relate to a Power Supply used in a PC ]

A bad Power Supply will have a weak voltage power rail.
There are three major power rails used in the ATX form factor Power Supply, for an eMachines T6420 desktop computer.

A) The 3.3 Volt power rail (DC)
B) The 5 Volt power rail (DC)
C) The 12 Volt power rail (DC)

(Two D cell flashlight batteries produce 3 Volts DC)

A Power Supply with a weak voltage power rail, may have enough power to light LED lights, and spin fans, (or spin a few times, ans stop), but won't have enough power to turn the Processor on.

1) ALL the LED lights combined use less than 1 Watt of power

2) EACH fan uses 2 to 3 Watts

3) A typical Processor can use 51 to 125 Watts.
Depends on what Processor it is.

eMachines T6420?
Uses an AMD Athlon 64 3400+, processor.
(Socket 939)

[The motherboard used is an MSI ms-7207
Also known as K8NGM2-L ]

http://www.emachines.com/support/product_support.html?cat=Desktops&subcat=T%20Series&model=T6420

This Processor can use Up To 89 Watts.

http://en.wikipedia.org/wiki/List_of_amd_athlon_64_processors#.22Newcastle.22_.28CG.2C_130_nm.29

No Processor running, No computer.
No computer = No Video Signal

Suggest using a KNOWN to be Good, Compatible power supply, for a test unit, if available.

Should be the ATX form factor.

Approximately 6 inches Long, (15.24cm), 6 inches Wide, (15.24cm), and 3-1/2 inches Tall. (8.89cm)

250 Watts.
Correct amount of power cables, and the correct type.

Sep 20, 2010 | E-Machines T6420 PC Desktop

1 Answer

The computer is turning on, but the monitor wont. the monitor keeps saying it in "power saving mode".


Perhaps the computer is Not turning on at all, and only seems like it is. Monitor's will go to 'Power Saving Mode' due to No Signal.
No video signal.

The computer isn't sending a video signal to the monitor, therefore the monitor goes into a power saving mode.

I suggest first checking the monitor cable, if it is a detachable unit. Use a Known to be Good monitor cable in it's place, or use the monitor, AND the monitor cable, on a computer that is known to be good.

Cable checks out?
Then I suggest cleaning out the inside of the computer, if the computer is dirty inside, and also the Power Supply.
Use a can of compressed air for computers.

[Attach the plastic straw provided with the can of air, to the can of air's nozzle.
When you go to clean out the inside of the Power Supply, you will have to use the plastic straw, through the ventilation holes in the Power Supply's case.

Hold on to the plastic straw with one hand, use the other hand to hold the can of air.
The plastic straw can shoot off of the can of air's nozzle, and wind up inside the case of the Power Supply, if you don't.
Real riot trying to fish out the straw ]

The above is a prerequisite before working on the computer.
Also heavily suggest you observe Anti-Static Precautions BEFORE you reach inside the computer.

[Anti-Static Precautions:
Your body carries Static electricity.
Static WILL fry out (Short Circuit) the delicate hardware components inside a computer.

Relieve your body of Static.

Computer off, UNPLUGGED from power, computer on a table, computer case open.
TOUCH the metal frame of the open computer case, to relieve your body of Static.

Should you get up, and walk away in the middle of working on your computer, upon your return be SURE to touch the metal frame again ]

Problem could be with the 'graphics engine' of your computer, but experience, and observation through the years makes me lean more towards a bad Power Supply.

['Graphics engine'. The GPU. Graphics Processing Unit.

Can be Integrated Graphics, or a dedicated graphics adapter card.

Integrated graphics is also known as OnBoard graphics.
On the motherBoard.
The GPU is soldered to the motherboard.

A dedicated graphics card, (Graphics adapter card), has it's own GPU.

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

Weak Voltage power rail.

[Voltage Power Rail:

The Power Supply in your eMachines computer, converts AC electricity from your home, or business, to DC electricity.
(An example of stored DC electricity, is a D cell battery used in a flashlight )

There are three main DC voltages produced,
A) 3.3 Volts (3 point 3)
B) 5 Volts
C) 12 Volts

(Two D cell batteries produce 3 Volts DC)

Each of the Voltages indicated above emit from one power rail, inside the Power Supply.
The 3.3 Volt has it's own power rail, same with the 5 Volt, and the 12 Volt.
(Your eMachines power supply, does not have multiple 12 Volt power rails. Unless it isn't the stock power supply that came with the computer ]

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

Weak Voltage power rail.

1) ALL the LED lights combined, use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts

3) A typical Processor can use 51 to 125 Watts. (Less for older Processors. Such as Pentium III's for example)

With a power supply that has a weak voltage power rail, the lights will light, the fans may spin, (Or spin a few times then stop), but the Processor won't have enough power to turn on.


Lights, and fans can spin all day, the Harddrive may sound like the Platters are spinning inside, but if there is no Processor operating, there is No computer.

[Information on Harddrives, and the aforementioned Platters,

http://computer.howstuffworks.com/hard-disk.htm ]

Suggest you check the voltages produced by the Power Supply, or use a Known to be Good, Compatible power supply for a test unit.

[Compatible:
Right size, and shape of power supply case.
Correct amount of power cables, and the correct power cables,

http://www.playtool.com/pages/psuconnectors/connectors.html

For any questions regarding any of my statements above, please post in a Comment.

Aug 05, 2010 | E-Machines eMachines Desktop PC

1 Answer

My pc is an emachine but when i try to turn it on it automatically turns off but the fan is running


The power supply is bad. Electrolytic Capacitors inside the power supply. The 'Caps' are filters for the power supply. (Used in both the Input Stage, and Output Stage)

Inside the power supply are Voltage Rails. The 3.3 volt rail, the 5 volt rail, and the 12 volt rail.
Bad capacitors = a bad voltage rail. Not enough power from the power supply. Your processor doesn't have enough power to turn on, or stay on.

Why is the fan running?
ALL the lights use less than 1 Watt of power.
EACH fan uses 2 to 3 Watts.
A processor can use 55 to 125 Watts. Depends on what processor it is.
Plenty of power to spin a simple fan, but not enough power for the processor.

Yes I'm sure, is the answer to your question.
(No I'm not psychic. Approximately 80 percent of the computers that come into my shop, have bad power supply's)

Jul 29, 2009 | E-Machines eMachines Desktop PC

1 Answer

EMachines T2245 won't turn on, front light stays on


IT CAN BE MANY THINGS 1 UNPLUG SYSTEM FROM THE WALL, 2 REMOVE THE MEMORY AND REINSTALL THEM, 2
CHECK ALL CONNECTION INSIDE THE COMPUTER CASE AND THE OUTSIDE TO, 3 TO REMOVE A POWER SUPPLY IS 4 PHILLIPS SCREWS POWER CONNECTIONINSIDE CASE, REMOVE THE POWER FROM ALL OTHER DEVICE CAREFULLY AND TAKE IT TO YOUR NEARST COMPUTER STORE, SAVE YOUR RECIEPTS IN CASE IT IS NOT THE POWER SUPPLY PROBLEM, RETURN IT AND GET YOUR MONEY BACK.
POWER SUPPLYS SHOULD NOT COST MUCH, IFYOU ARE STRAPED FOR MONEY GO TO GOOD WILL AND HAVE THE FIRE UP ONE OF THE SYSTEM THEY HAVE THEY MAY EVEN HAVE A NEW ENPTY TOWER CASE LAYING AROUND FOR 30.00 DOLLARS.

CANDYMANGANDY

Jan 29, 2009 | Bestec (ATX-250-12E) 250-Watt Power Supply

1 Answer

Computer will not turn on


Best way to check is to open your case. Near the power supply plug to the motherboard should be a little led light. If it is getting power to the board this light should be green. If it's unlit then most likely your power supply has gone bad. Hope this helps.

Dec 21, 2008 | E-Machines Emachine T5026 power supply **...

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