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  #1  
Old 03-03-2009
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Join Date: Jan 2009
Posts: 61
Problem with my Power Supply Unit

hi there

Few days back I was playing some music on my computer and suddenly it got shut down. The power was still on but the monitor just switched off.

I also tried turning off and again reboot but it won't boot me to bios now. The keyboard not light up during boot and the monitor display is deactivate mode.

Trying several things, I noticed that I am unable to reset the PSU or hold the Power switch for a short while to switch it off. BUT when i eject the 4 Pin 12v smps from the computer, it doesn't allow me to use the front panel reset and power switches.

I did a test with PSU using a testing device and noticed that the -5v was not lit I assume that this may be a problem. I have tried removing certain components and the motherboard beeps under certain circumstances so I assume it's still doing something.

Please help me regarding this problem

Your views will be appreciated
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  #2  
Old 03-03-2009
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Join Date: Nov 2005
Posts: 2,326
Re: Problem with my Power Supply Unit

Sounds like a PSU issue, BUT my friend had this problem, he replaced his PSU and it was his mobo aswell. Try get another PSU from one of your friends or one you can find anywhere and try it.
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  #3  
Old 03-03-2009
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Join Date: Nov 2005
Posts: 2,477
Re: Problem with my Power Supply Unit

The power supply converts your regular household current into low DC voltage used by the computer. When this component fails, there is simply no activity going on with your computer. Remember to do the easy troubleshooting first. Inspect the power supply for any damage. Double-check all connections.

Learning how to check your power supply and how to replace it when needed can be a lifesaver if you?re a computer buff or in business with the trusted PC. Don?t take for granted the simple pleasure of turning on your PC and everything works just fine.

We turned on one of our computers recently and in about one hour, it just rebooted itself. And it continued doing so about ten times a day until we found out the power supply was the culprit.
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  #4  
Old 03-03-2009
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Join Date: Nov 2005
Posts: 2,487
Re: Problem with my Power Supply Unit

No Power To The Computer
Here you must first check the wall outlet for power by connecting another device such as a radio or lamp to be sure power is present. If the computer is connected through a surge protector, check it as well.

If the wall out has power, check the power cable going to the PC to see if AC voltage is making its way to the system unit. Do this with the use of a multimeter.

If there is power, you will have to open the PC and check for power from the power supply to the motherboard.

When using a multimeter to check voltage, be sure you have a good ground for the black lead of the multimeter.
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  #5  
Old 03-03-2009
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Join Date: May 2006
Posts: 2,800
Re: Problem with my Power Supply Unit

Checking The Power Supply
If the wall outlet and the power cord are good, make sure the connection at the motherboard is secure. Then you may have to face the fact that the power supply itself is bad. If you have a multimeter, you can test the power supply output before purchasing a new one. Simply follow these steps:
Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard.
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  #6  
Old 03-03-2009
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Join Date: Sep 2005
Posts: 2,321
Re: Problem with my Power Supply Unit

Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

DO NOT remove the power supply from the system unit case when performing these tests. DO NOT perform these tests if you do not feel comfortable. Be sure to remove any and all electrical static build-up from your clothes and body BEFORE touching any parts inside the system unit. And NEVER open the power supply case for any reason, since high voltage may be present.
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