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ATX -250-12E Power Supply

The computer power supply does not power up , the fan spins freely.
I get no voltage at connection plug for hard drive , cd rom ect.

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U need 2 replace ur power supply.

Posted on Jul 23, 2008

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Why wont my computer turn on no lights but fan starts


Replace power supply with an other unit. Power supply differences AT the very old PCs of DOS only and start of windows area. ATX start off Pentium 3 area. ATX with added 4 plug for power of CPU control. New power plug for motherboard of Pentium 4 Birth. Power supply still giving old ata hard drive power only. Addition of Sata power connections/ and now the deletion of the old ata power connections fully from power units.

May 27, 2014 | HP Pavilion Computers & Internet

1 Answer

Green blinking light on power supply. Computer will not power on. Power supply appears to be good because I connected black and green leads from motherboard connector with a small piece of wire, and the...


One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electic extensions or just replace them they are probably old and faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error

hope this helps
don

Feb 12, 2011 | HP ATX-300-12Z (ATX30012ZBD) 300-Watt...

1 Answer

How to tell if the power supply is bad.


You can check if the power supply is bad using a multitester.

Connect the power cord at the back of the power supply and plug it in an AC outlet. Measure the voltage out from the connector. Using the multitester (set it to DC range), insert the black probe to one of the black wire in the peripheral connector of the power supply while the red probe in the yellow wire. Reading should be +12VD. Now, transfer the red probe to the red wire, reading is +5VDC. Reading below this measurement is a clear indication of a bad power supply.
Put some load in it, like connecting a hard drive or a cd rom drive.Try measuring the output voltage again. If voltage out dropped then it is Bad.

Hope this will help you understand.
Thank you for using Fixya.

Jan 08, 2011 | E-Machines Bestec ATX-300-12E Rev. D 300w...

1 Answer

Gateway mx6448 Notebook will not power on, Red LED flashes 4 times when power on button is pressed then nothing happens. It is the same with only the battery. LED will not flash if I have only the power...


There can be many things associated with no power to the computer.
  • The outlet into which the computer is plugged may be inoperative.

  • The surge protector you are using may be inoperative.

  • The power cable may be loose or damaged.

  • An internal device may be damaged.

  • The power supply may be inoperative.

Basic Troubleshooting Power to the Computer
There may not be a consistent flow of power to the computer.
  1. Verify that the outlet into which you are plugging the computer is operational.

  2. If you have the computer plugged into a surge protector, plug it directly into the outlet.

  3. Verify that the power cable is plugged securely into the back of the computer.

  4. If you have a monitor with a removable power cord, swap the power cords between the monitor and the computer.

Note: If you recently added a new hardware device prior to experiencing the no power issue, turn off the computer and remove the newly added hardware. If there is still no power, reseat all the other cards and cables in the computer to verify that all other devices are seated securely.
Resolving Power Supply Issues
  • External Device Conflicts
  • There may be an external device causing the computer not to turn on properly.

    1. Before continuing, verify your computer is turned off.

    2. After you have established that adequate electricity is going to your computer, verify that the voltage switch on the back of the power supply is set correctly. The small red switch is to be set to the 115-volt setting.

    3. Remove all external devices except the monitor and turn on the computer. If the fan on the back of the computer now spins, turn off the computer. Plug in the external devices one at a time and turn on the computer after each device is added.

    4. Note: If you removed all external components and the fan on the back of the computer does not spin, the problem is with something inside the computer.

  • Internal Device Conflicts
  • This helps determine if the issue is a damaged or badly seated component.

    1. Verify that the computer is turned off.

    2. Remove the case from the computer.

    3. Remove all the red, yellow, and black power connectors from each floppy disk drive, CD-ROM drive, and tape backup unit that is in the computer. The only devices connected to the power supply are your hard disk drive and motherboard.

    4. Turn on the computer and verify that the fan on the back of the computer spins. If it does not spin, turn off the computer.

    5. Remove the power connection from the hard disk drive and reconnect power to one floppy disk drive. Turn on the computer and verify that the fan on the back of the computer spins.

    6. Reseat the power connection from the power supply to the motherboard. Turn on the computer and verify that the fan on the back of the computer spins. If the power has been restored, turn off the computer and reconnect the power connections to the devices. Test the computer for power after reconnecting each device.

  • Power Switch
  • The power switch may not be functioning properly.

    1. You may need to open the case and readjust the power switch.

    2. Locate the control panel inside the computer and remove any screws holding it in place.

    3. Turn on the computer with the control panel removed by pressing the button on the control panel that corresponds to the power button. If the power supply fan spins and/or the computer turns on, put the control panel back in its place. Try to turn on the computer again.

  • Test Switch and Diagnostic LED
  • Note: Not all power supplies have a test switch and diagnostic LED.
    Certain power supplies have a test switch and LED to help better troubleshoot the device. The green LED is always on when the computer is powered on. If the computer is not receiving power please perform the diagnostic test below.

    1. Verify that the computer is turned off.
    2. Remove the case from the computer.
    3. Remove all of the red, yellow, and black power connectors from each floppy disk drive and ROM drive and the tape backup unit (TBU) that is in the computer. Remove all power connectors from the motherboard. The only device that needs to be connected to the power supply is the hard disk drive.
    4. Press and hold the test switch for five seconds on the power supply, and then verify that the green light on the power supply comes on.
    5. If the light comes on:
      1. The power supply is good and something that was plugged into the power supply is causing the computer to not turn on.
      2. Plug devices in one at a time, testing with the test switch between each device to determine what is causing the power issue.
      3. If all devices are plugged in and the light is working, the connections may have needed to be reseated, or it is possibly a power switch issue.
      4. Go to the power switch section of the power supply checklist for additional troubleshooting steps.

    6. If the light does not come on:
      1. Disconnect the power from the hard disk drive, and then plug in power to the CD-ROM drive and determine whether the light comes on.
      2. If it does, follow the preceding information - "If the light comes on."
      3. If the light still does not come on, contact Gateway Technical Support.

    7. Confirm that power from the power supply is connected to the motherboard. Remove all cards and cables from the motherboard, and press and hold the test switch for five seconds on the power supply and determine whether the green light-emitting diode (LED) comes on.
    8. If the LED comes on, put the devices back in one at a time, testing between each device to determine what is causing the issue.



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Dec 02, 2010 | Gateway MX6448 Notebook

2 Answers

How to power up a compaq 243890-001 power supply without the the motherboard? Its not green to ground


Remove Power Supply
1 . Shut down your computer and unplug the power cord and all cables connected to the system.

2 . Open the computer case and disconnect all power connectors from the motherboard, drives, cards and fans.

3 . Remove the four screws that secure the power supply to the case. These screws are located on the back of the computer case, at each corner of the power supply.

Wire and Start Power Supply
1 . Switch the power supply to the "Off" (sometimes "O") setting.

2 . Insert the end of one wire from a single pole, single throw (SPST) switch into the green wire of the ATX power connector (the largest power supply connector).

3 . Insert the end of the other wire from the SPST switch into the black wire of the ATX power connector. If your power supply has two black wires, connect the SPST to the black wire directly beside the green wire.

4 . Wrap electrical tape around the ATX power connector and wires from the SPST switch to hold them in place. Make sure there is no exposed copper or silver wire from the SPST switch wires.

5 . Turn the SPST switch to the "Off" position, if not already set. Plug the power supply into the wall outlet and switch it to the "On" (sometimes "I")setting.

6 . Connect any other computer components that you wish to operate without the motherboard, such as fans, drives or cards. Turn the SPST to the "On" setting to activate the power supply.


Hope the above information will be helpful to you.
Thanks.

Dec 01, 2010 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

Green light on power supply flashes rapidly when I plug the computer in. Computer will not power up at all (no cooling fans start, no lights illuminate and no beeps come from the unit). When the power...


if the cooling fan on your PSU power supply unit does'nt spin when you start your PSU is faulty if it does then
replace all the leads that attach to your hard drive including electrical extensions + IDE,SATA the ones that attach from your motherboard to hard drive
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
hope this helps

Oct 21, 2010 | HP ATX-300-12Z (ATX30012ZBD) 300-Watt...

1 Answer

I have an emachine et1161 i hit the start button and the prosser fan starts but nothing else if i hold the start button then the cd rom starts and i can feel the hard drive start but nothing will come on...


Suggest you change out the Power Supply, with a KNOWN to be good, and compatible Power Supply.

[Compatible:
Must have the correct power cables, and the correct amount of them.
1) 20-pin ATX main power cable;

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

2) 4-pin ATX +12 Volt power cable; (Power for the Processor)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

3) SATA power cable; (Harddrive)

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

4) Standard 4-pin Peripheral power cables for the optical drive/s, and any fans;

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

5) Floppy Drive power cable. Not used for a Floppy Drive in this case, but power for the Card Reader;

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

Must have the correct Form Factor.
The Form Factor of the Power Supply for the ET1161 is ATX.
Size of the Power Supply case is approximately 3-1/2 inches Tall, 6 inches Wide, and 6 inches Long.

Should have 250 to 300 Watts.

Why am I stating this? Because you, or someone you know, may have an unused computer sitting around that you can borrow the Power Supply for a test. (GOOD and Compatible)

From your statements, and my diagnosis, I believe you have a bad Power Supply.
Weak voltage power rail.

Enough power to turn on LED lights, and spin fans, but not enough to turn the Processor on.
1) ALL of the LED lights combined 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.

I also base it on that eMachines uses low quality generic Power Supply's.
Bestec, or Delta, or another generic Power Supply manufacturer.

I also base it on that Power Supply failure is one of the leading causes of computer failure.

(If the inside of the computer, and the inside of the Power Supply, are not cleaned out on a regular basis as needed, this is also another contributing factor.

Use a can of compressed air for computers. Power unplugged to computer, and observe Anti-Static Precautions.
{Use the plastic straw in the ventilation holes of the Power Supply)


Feel the harddrive start? Yes. You feel the Platters inside the harddrive being spun by the spindle motor.

No Processor operating, there is nothing to find the boot record on the harddrive. The platters spin, but the Read/Write heads are not brought into play by the Actuator motor

[BIOS = Basic Input/Output System.
A small program that when the computer is first turned on, looks to see what devices are installed, does a Ram Memory count, then TURNS the Processor on, and hands the computer over to the Operating System.

An optical drive, (CD/DVD drive) will operate even if the Operating System doesn't. It's a mechanical device that uses 12 Volts.
(One example of an Operating System is Windows XP ]

How harddrives work;

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

Sep 25, 2010 | E-Machines Computers & Internet

2 Answers

When I turn it on, only the fans run. I cannot hear the hard drive run and the hard drive light on the bezel is solid yellow


look on bios to see if detects the hard drive ...if does not boot to windows...the hard disk has no reason to go on ....and the issues could be many ....check the Ram memory if do not appear anything on screen at all ...and just runs the coolers and clicks without boot at all...in this case its the Ram memory ...so check it ...get it out ..put it back ...and remove the bios battery to force it see them again .....if it is booting until the operating system should appear ...and after that nothing ...reinstall ...
Also .....if there is anything written on the screen ..read carefully ..usually it will say whats wrong ...and advise in same issues..like replace hdd ...or files missing ...or blue screen error from memory issues..

Nov 07, 2009 | E-Machines T6216 (827103077834) PC Desktop

2 Answers

Old power supply no good. bought this dynex 400 watt atx cpu power supply and need to know how to connect wires as there are some plugs that can go in multiple spots.


as long as you have the 20 or 24 plug in and the 4pin square plug in plus the hard drive dvd floppy fans i donot no your motherboard or graphic card so i cannot say anymore only next time write down your conections before removing power supply or get manual for your pc

Jul 30, 2009 | Dynex 400-Watt ATX CPU Power Supply

1 Answer

I purchased a zion 2 case and I cant figure out the fan plugs because the plugs are like the ones use for cd burners to power themup


To connect the power cable, just take the 4-pin connector coming from the fan and connect it to any 4 pin connector coming from the power supply. you can then use the 4-pin connector to power a cd/ dvd drive or ATA hard drive
~gnomer

Jan 31, 2009 | XION II Mercury (XON102) ATX Mid-Tower...

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