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System Failing to Completely Power on


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4 replies to this topic

#1 vayne24

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Posted 06 May 2010 - 08:01 AM

Greetings

The Problem Started after a Power Outage. At first, the only problem was that it hangs up (or possibly just loading for too long)
While loading devices specifically while loading the hard disk. i restarted the pc a few times but to no avail. though sometimes it goes past that point but then never to the xp loading screen.

So I left it for some time to cool down then turned it on later. Same results.
So I decided to reconnect the hard disk's cable and restart. Nothing appears on the monitor anymore, Monitor's light flashing from orange and black
I Reseated the Memory and restarted. Same Results

I'm not sure at what point it started to happen but when i tried to observe the CPU's behavior closely, I discovered that the fans stop working on about 15 seconds after pressing the power button. i thought the system was off but when i tried to turn it on again by pressing the power button, nothing happens. So i held the power button down,released it and press again. The Fans start to spin again but only for about 15 seconds again.

I did do anything after this point

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#2 meuchel

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Posted 06 May 2010 - 03:05 PM

power outages usually take out power supplies first.
i would definitely check to see if your power supply is putting out proper voltage.

#3 Sneakycyber

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Posted 06 May 2010 - 04:57 PM

Was the computer plugged into a Surge protector? It sounds as if the power outage or brown out may have caused a power surge or Transient that may have fried the PSU or at worse the whole computer. If you have another power supply from another working computer you can swap them and see if the computer turns on or not. If you don't have one you can try you can manually test with a DMM. The purpose of this procedure is to bypass the motherboard to test a ATX PSU. Some manufacturers Like Dell have used some non ATX PSUs which have a different pinout for the 20/4 pin connector, please confirm that your PSU is a ATX type before using this procedure.

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.

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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.

You can compare the voltages to these. If the PSU seems ok its likely the motherboard. If you have home owners insurance or a renters insurance policy see if the computer is covered most policies cover for natural occurrences depending on your deductible you may be in for a new system for not too much money.

Chad Mockensturm 

Systems and Network Engineer

Certified CompTia Network +, A +


#4 vayne24

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Posted 18 May 2010 - 10:48 PM

I tried replacing the power supply and it's all fine now.

Thanks for the help

#5 meuchel

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Posted 19 May 2010 - 09:16 AM

good deal.




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