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4 replies to this topic

#1 Cool1

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Posted 21 February 2009 - 10:18 AM

My computer will not power on, i was installing Print Shop on my computer, i left out of the room & came back & my computer was off. I tried to cut it on but it would power up, so i left it alone until this morning, I unplugged everything & just plugged in the power cord only after i took off the cover. When i plugged the cord in the power supply the fan came on for only 2 seconds & cut off, it would only do that if i unplugged it & plug it back.

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#2 hamluis

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Posted 21 February 2009 - 12:10 PM

Have you looked at your owner's manual...for procedures to be employed for troubleshooting problems?

System manufacturer and model?

Laptop or desktop?

If desktop...you have temporary access to a different system power supply?

Do you have a Microsoft XP install CD?

Louis

#3 Cool1

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Posted 21 February 2009 - 11:24 PM

No, i bought this computer refurbished, i've had this computer for about 6 or 7 years. It use to always beep, i couldn't figure out why. I'm hoping it's just the power supply, like i said when i unplugged & plug it back up the fan only blows about 1 to 2 seconds & then it cuts off.

#4 jon0111387

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Posted 21 February 2009 - 11:40 PM

You have a few options.

1. Open up your computer case and check for any lose cables. You should have at least 2 cables connecting from your power supply to the motherboard.

2. Buy a power supply tester, they range from $10 - $40.

3. If you know the power supply is bad you can go out and purchase one, they start out at about $25. Make sure you buy the right one for your motherboard, if you open up your pc case there should be a sticker on the side of the power supply with the model. If you do replace it remember how you disconnect your old one and re-connect the new one EXACTLY the same.

#5 dc3

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Posted 22 February 2009 - 03:50 AM

If you have a Voltmeter try using the following method.


The purpose of this procedure is to bypass the motherboard to test the PSU.

Caution:
This procedure will involve working with live 12VDC electrical potentials which if handled improperly may lead to electrical shock. Proper precautions should also be taken to prevent electrostatic discharges (ESDs) within the case of the computer. For safety purposes please follow the instructions step by step.

First, shutdown your computer. Then unplug the power cable going into your computer.

Once you have opened the case, touch the metal of the case to discharge any static electricity.

The connector of the PSU which connects to the motherboard is readily recognizable by the number of wires in the bundle. To disconnect it you will need to press on the plastic clip to disengage it and then pull the connector up and away from the motherboard. Please take notice of the location of the locking tab and the notch on the socket of the motherboard, this will only connect one way as it is keyed. This wire bundle will have a memory of the way it has been installed and will want to bend back that direction, you may have to play around with it to find a position that the connector will stay in the same position while you run the test.

Posted Image

From the top left to right the pins are 13-24, the bottom from left to right are 1-12.


Please notice that there are PSUs with 24 pin and 20 pin connectors, the location of the green wire in the 24 pin connector is #16, and the green wire in the 20 pin connector is #14. If you look at the connector with socket side facing you and the clip on the top the number one pin will be on the bottom left corner. This makes the pin out for the 24 pin connector from left to right 13-24 on top, and 1-12 on the bottom. The pin out for the 20 pin connector from left to right is 11-20 on top , and 1-10 on the bottom. If you look at the connectors you notice that these are sockets that fit over the pins on the motherboard where the PSU cable attaches, this is where you will place the jumper. For a jumper you will need a piece of solid wire about the size of a paper clip (20-22 awg), preferably a wire with insulation. It will need to be large enough to fit firmly into the socket so that it will not need to be held in place while testing. You are at risk of electrical shock if you are holding the jumper when you power up the PSU. Insert one end of the jumper into the socket of the Green wire, and insert the other end into the socket of any Black wire.

Once the jumper is in place plug the cord back in. If the PSU is working properly the case fans, optical drives, hdds, and LEDs should power up and remain on. I would suggest that you not leave this connected any longer than is necessary for safety purposes.

At this point you can use a DC Voltage meter to read the different rail Voltages. You will want to insert the black probe into any of the Black (-) sockets, and insert the Red (+) probe in the five different colored sockets, one at a time. Below are the five different colors and their corresponding rail voltages. The Voltages should be within about ten percent plus or minus of the given values.

Yellow +12VDC

Blue -12VDC

Red +5VDC

White -5VDC

Orange +3.3VDC

To reconnect the 20/4 pin connector unplug the power cord, remove the jumper, and reconnect the connector. Take a moment at this time to make sure that nothing has been dislodged inside the case.

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