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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No power when I switch on computer. Fan not running, power light not coming on. Have tried plugging in to different socket. Still nothing. Taken case side off, double checked all fittings. Cleaned computer interior & fan. Still dead.

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  • E-Machines Master
  • 5,660 Answers

If you know the receptacles that you have plugged the computer into, indeed have power, I would suggest you diagnose the Power On switch, and the Power Supply.

See of the problem is the Power On switch, or the Power Supply.

A jumper wire is used on the main ATX power cable.

1) If the Power Supply comes on you have a bad Power On switch.
2) If the Power Supply does Not come on, you have a bad Power Supply.

Your problem is posted in the eMachines Bestec ATX-300-12E power supply section.
Going with that we are discussing a Bestec ATX 300 watt power supply, the main ATX power cable is a 20-pin ATX main power cable.

Typical pinout of a 20-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Note the Green wire in the BACK of the connector, in the photo to the far right.
This is the Soft Power On wire, or also abbreviated as the PS_ON wire.

Note the Black wires. ANY Black wire is a Ground wire.

With the 20-pin ATX power cable plugged into the motherboard, as shown in the photo, a jumper wire is touched to the Green wire, and to ANY Black wire.
The computer (Power Supply) is also plugged into power.

Generally a paper clip is used for the jumper wire.
The paper clip is straightened out, then bent into a U shape.
Black plastic electrical tape is then wound around the middle of the U shape.
This taped area is for your fingers, and thumb to hold onto.

The 'legs' of the paper clip, are then inserted down into the socket holes, in the back of the 20-pin ATX main power cable's connector.

Down into a socket hole with the Green wire, and also into a socket hole with ANY Black wire.
The 'leg' of the paper clip goes down into the socket hole, RIGHT NEXT to the existing wire.

At the end of every wire in the 20-pin ATX main power cable, is a metal terminal end.
The metal terminal end is pretty far down in the socket.
You must ensure that the metal end of the paper clip, touches the metal terminal.

The voltage is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
There may be a small spark as you make the connection.

Warning you in advance.
You can see the voltage is VERY low, however.

I would like you to perform this test, then post back in a Comment as to your findings.

Regards,
joecoolvette

Posted on Apr 03, 2011

  • joecoolvette
    joecoolvette Apr 04, 2011

    Thank you for the rating easycoustic, Most Kind!

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  • Contributor
  • 23 Answers

Is there a flat toggle switch on the back of the power supply? If so, is it in the "on" position? If there is no switch, or the switch is on, then check to see that the 20 (or 20+4) pin cable that attaches to the motherboard is properly seated. That connection is usually in the middle of the right side of the motherboard, and it is the biggest single cable coming from the Power Supply. On some newer motherboards, there is a separate 4 or 8 pin connection as well, and is commonly near the upper left of the motherboard, though it could be located just about anywhere. If all of the motherboard connections are in tight, your PC should at least turn on (POST). You can check to see if there is any power coming from the Power Supply with a multimeter if you have one and are comfortable using it.

If you don't find the problem with the tips above, then it sounds like your power supply is dead. Sometimes a PSU (Power Supply Unit) Dies unexpectedly without any real evidence, or it has a fiery/smoky smelly death. Get a new Power Supply, I suggest one with good user-ratings. There are cheap power supplies that look like they can handle what you have, but they tend to not last long.As a rule, I don't spend less than $40 on a PSU unless I plan on replacing it soon.

Posted on Apr 03, 2011

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