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The Power Supply convert's
your regular household current into low DC voltage used by the computer.
When this component fails,there is simply no activity going on wih your
computer.Remember to do the
We turned on one of our computer's recently and if about one hour,it just re-booted itself.And it continued doing so about 10 times a day until we found out the power supply was the culprit.Things to look for when your power supply is going bad or just dies on you are the following....
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 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 computer 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.
RE-BOOTING PROBLEMS One main problem you may face with an ailing Power Supply is that it may re-boot the computer without any warning.All information is lost and it seems as though this happens at the worst possible time.Booting errors when the computer first start's up is another indicator of this component going on the blink.
POWER DISTRIBUTION PROBLEMS When the power supply begins to fail,you may receive power at one device and not another.For example,the Hard Drive may receive power but the CDROM Drive has nothing at all. Another headache with would cause re-booting is the intermittent power going to the drives or the motherboard itself.Follow the steps below to check your power supply should you experience some of the above problems.
CHECKING THE POWER SUPPLY If the wall outlet,and the power cord are good,as well as 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 similair to the hard drive,or floppy drive connector
that is unused and turn on the PC.You can also unplug a drive connector
and use it as well.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 onthe 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 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 readingon 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
If the Power Supply is a couple of volts off,in either direction,such
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.
Otis F. Cooper
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