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Help Computer Cant Stay On!

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3 replies to this topic

#1 ianian112


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Posted 08 June 2008 - 01:03 PM

ok my computer recently cant stay on for more then a minute sometimes the intake fans wont turn on, when that happens my computer cant even boot the drivers, when the fans do turn on one makes a little clicking noice help me! always when the side fans dont turn on and i turn off the computer the green light goes off(power) but the red light stays on(shows the computer is working) and the only way to turn that off is to turn off the power supply

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#2 garmanma


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Posted 08 June 2008 - 03:21 PM

The red light means nothing. You probably have a bad power supply:

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

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.

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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.

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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#3 Nyctor


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Posted 09 June 2008 - 03:40 PM

Most likely a bad PSU If you don't want to do the above(I wouldn't) just try a known working PSU and see how that works

#4 Jagraj Gill

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Posted 09 June 2008 - 10:00 PM

The red light has nothing to do with why your computer is acting that way.

In your situation, the problem is most likely caused by a faulty power supply. If you made any recent upgrades you should check to see if your PSU has enough wattage to supply to all your computer hardware parts.

Here is what I would do in order to find out the problem:

*Before even thinking there is a problem to your PC, I would always check to see if all the power leads are tightly connecting to all components. Sometimes the motherboard power connector is loosely fit and it may be the cause of one's pc constantly turning off and on. *

1. First remove all devices from the power supply except for the motherboard, and processor power (if your processor needs it) . Boot into the BIOS and wait to see if it turns off or not.
2. If your computer turns on and you can at least see some startup information, your mobo is fine.
3. If it turns off at this moment your 90% dealing with a faulty power supply.
4. If it stays on start to add on devices such as the hard drive, then the cd/dvd drive, and floppy etc. one by one, and if at one point after you added a new component to your power supply it turns off, you may need a higher wattage PSU.

There is not much that I can go on because you have not giving me any specifications on your PC.

If these steps don't work follow what Mark said above, I'm sure that will help out as well.

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