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Computer shutting off

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#1 jwalker056


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Posted 03 February 2009 - 11:00 AM

I recently rebuilt my computer (back in August). The hardware is as follows: Intel Core 2 Duo E8400 Wolfdale 3 Ghz LGA 775 65W Dual Core Processor, Biostar TForce TP43 HP LGA 775 Intel P43 ATX Intel Motherboard, EVGA 512-P3-N807-AR GeForce 8800 GT Akimbo 512 MB 256 Bit GDDR3 PCI Express 2.0x16 HDCP ready SLI supported video card, 2x1 GB 240-pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel and Rosewill RP600V2-S-SL 600W ATX 12V v2.01 SLI ready power supply. About a month or so ago, my computer wouldn't turn on, you push in the power button and get absolutely nothing. I contacted a friend of mine who said it was either the power supply or the power button. I ordered a new power supply and installed it. The computer came on no problem and worked great for about 2 weeks. Yesterday, I went to turn it on, pushed the power button and got nothing. I giggled the cord on the back of the computer and it came on. It stayed on for about 15 minutes and shut off. I tried different power cords and it would try to come on, but shut right back off. Eventually, it wouldn't come on at all. Could it be the power supply again, maybe I have to much on there and it doesn't have enough power or is it something completely different? Would appreciate any input you can offer. Just as additional information, I am running Windows XP Professional SP3.

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#2 Sterling14


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Posted 03 February 2009 - 07:17 PM

Did you remember to put the stand offs between the case and motherboard while building the computer?

Here's a guide on how to test your power supply:

Caution: There are electronics inside the case that are very susceptible to electrostatic discharges. To protect your computer, touch the metal of the case to discharge yourself of any electrostatic charges your body may have stored before touching any of the components inside. As a safety precaution you should unplug the computer to avoid electrical shock.
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.

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.
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 of the given values.

Yellow +12VDC

Blue -12VDC

Red +5VDC

White -5VDC

Orange +3.3VDC

Edited by Sterling14, 03 February 2009 - 07:17 PM.

"I think there is a world market for maybe five computers." - Thomas Watson, Chairman of IBM, 1943

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