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PSU not working within my computer

I have a dell dimension 4550 and recently I tried to up grade the power supply by buying a Turbolink ATX 2.03 500W PSU. When I intstalled it, the computer would not turn on. I made sure all the connections were right and that when I connected the power I had the case open to make sure the motherboard light came on and it did, but the computer fan did not turn on and no boot up processes were started. Is there anything I can do to make this power supply work?

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  • jflynn Jan 31, 2008

    All the connections that can be pluged in are pluged in.

  • jflynn Jan 31, 2008

    it is a 20 pin, could it be that the power supply is just bad?

  • jflynn Jan 31, 2008

    I think it is dual rail, but I am not sure. how would I tell?

  • jflynn Jan 31, 2008

    it only has one 12v and it says 12v/6A

  • jflynn Feb 01, 2008

    I believe it say it is 12 amps/6 amps

  • Anonymous Jan 13, 2009

    Installed Power Supply have green light on Mother Board but when power button is pushed nothing happens. Unplugged and replugged all the connections with the same result. Installing on a Gateway 3200S.



    Thanks

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2 Answers

Try anther one just to make sure 20 pin or 24 pin

Posted on Jan 31, 2008

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  • Master
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12 v conecter pluged in also

Posted on Jan 31, 2008

  • 1 more comment 
  • nick helpap
    nick helpap Jan 31, 2008

    yes it could be one bad rail on power suplly is it dual rail

  • nick helpap
    nick helpap Jan 31, 2008

    says on box or suply it sels 12v+ 12+ do u see 2 or just 1 on stciker

  • nick helpap
    nick helpap Jan 31, 2008

    meens 1 rail how many amps on that rail says under it 15 amps 25a ? ect highbetter if its less then 25 amps on 1 rail pos then

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Computer shouts down in 15 to 20 seconds after starting


The specs say the PSU is ATX compatible. Whether that is for the connector only or for the whole power supply is something you will have to determine.

If you have an ATX power supply handy (like in an old computer) give it a try. This one is only 300 Watts so it won't likely be expensive to replace.

Have a look at: http://www.techspot.com/community/topics/dell-dimension-1100-shuts-down-after-20-seconds.135987/

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Have you tried reinstalling the system drivers? or even if possible update the BIOS? You'll know yourself that sometimes its just a re-install that fixes dodgy issues..... just a thought.

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I am looking at a Dell Dimension 4550 PC for a friend and it won't boot up...i push the power button on and there is an almost orange/greenish light on the power button... no beeps no diagnostic lights are...


Bad Power Supply. Weak voltage power rail.

[There are three main voltages produced by the Dimension 4550's Power Supply.
1) 3.3 Volts
2) 5 Volts
3) 12 Volts ]

The Power On button LED functions as a diagnostic light also.

Dell Support > Dimension 4550 > Service Manual,

http://support.dell.com/support/edocs/systems/dim4550/

Left-click on Solving Problems, then click on Power Problems

The Power Supply is just an ATX form factor version. The common Power Supply form factor used in MANY desktop computers.
(ATX form factor for a Power Supply refers to the size, and shape of the Power Supply's case.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall)

HOWEVER, (Not shouting), there is an area of concern, should you try a Power Supply you may have available for a test, or purchase one.

It involves the wiring of the 20-pin ATX main power cable. More specifically the power cable's connector.

To explain view the standard wiring, set for a 20-pin ATX main power cable's connector,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Looking at the photo to the far right, observe the color code of the wires, going down into the socket holes of the connector.

Look at the Lock tab on the side of the connector. This will help you orient the color code of the wires, and their placement in the socket holes, to the chart below the photos.

The connector on the end of the 20-pin ATX main power cable, is a Male connector.
Where the wires go into the connector, is the Back of the connector.
In the middle photo you can see the Front of the connector.

The wires going down into the ATX main power cable's connector, end in a female metal terminal.
The connector on the motherboard, (Shown in the photo to the Left), has Pins.
The metal female terminals go over the Pins.

The pins are numbered. The color code of the wires match up to the pins.
This is shown in the chart.

Now look at Dell Support > Dimension 4550 > Technical Overview > DC Power Connectors >
DC Power Connector P1

http://support.dell.com/support/edocs/systems/dim4550/techov.htm#1101897

The illustration may not be accurate. You'll have to compare since you have the computer, and Power Supply in front of you.

For a time period Dell was a Proprietary manufacturer.
Meaning they wanted THEIR parts used on THEIR computers, and ONLY THEIR parts.
They had the motherboard manufacturers make motherboards according to their specs.

One of the specifications was that the pins would be CHANGED around, in the motherboard connector for the ATX main power cable.

They also had Power Supply manufacturers make the ATX power cable to their specifications.

This means if a user bought an aftermarket Power Supply, the color code of the wires in the ATX main power cable would Not match.

Many users did buy an aftermarket Power Supply, and installed it.
Burnt motherboards, fried Processors, and graphics cards, resulted.

Orange wires are 3.3 Volts
Red wires are 5 Volts
Yellow wires are 12 Volts.
Black wires are Ground wires.

Guess what happens when you plug a 12 Volt wire into where a 3.3 Volt, or 5 Volt, or Ground wire is supposed to Be?
POOF!

My suggestion would be to look for a Power Supply that is an ATX form factor, is KNOWN to be good, and is compatible, for a test unit.
You, or someone you know may have upgraded to a better computer, and you may be able to borrow the Power Supply for a test unit.

Compatible:
Has the Correct power cables.
1) 20-pin ATX main power cable, OR a 20/24-pin ATX main power cable.
(20-pin connector that has an additional connector with 4 pins. Just use the 20-pin)

2) 4-pin ATX +12 Volt power cable. (Also referred to as P4 MB, and P4 ATX 12V)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

(Power for the Processor)

3) Enough standard 4-pin Peripheral power cables.
(Misnomered as Molex)

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

(Power for the IDE Harddrive, and Optical drive/s)

Also:
You can change the power wires around in the ATX main power cable's connector.
Change them around, in an aftermarket Power Supply's ATX main power cable's connector.

Want to know how post in a Comment.

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1 Answer

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try and use a different psu if you have one, if computer comes up then old psu is bad. or buy a cheap atx psu tester on amazon. As a technician, thats what i use

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You can replace the power supply in this Dell with a normal ATX power supply. Make sure the total wattage is equal to or greater than the old power supply.

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Hi there.
Rocket Fish RF-550wps PSU is standard ATX power supply.
Dell tend to use their own power supplies which differ slightly from standard power supplies.
I suggest you take or send the Rocket Fish RF-550wps PSU back as it won't fit and order one from Dell themselves, at least then you will have a guaranteed fit.
Once you have your new power supply from Dell (or a Dell ATX power supply) it should be easy to fit in.
Post back if you need any more help.

Good luck and thanks for using FixYa!!

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4 Answers

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http://www.discountelectronics.com/index.php?l=product_detail&p=1849

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You can try to rearrange from ATX form to dell form.
Here is ATX arangement
http://en.wikipedia.org/wiki/Computer_power_supply#Wiring_diagrams
and here is dells arangement
http://www.jdresearch.com/icon/shark20pin.jpg

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there are fuses inside psu`s some are solderd and some pop out it i would suggest that u throw the psu away and buy new chances are that it will only cause continues and may even result in 
complete mobo failure problems heres a link to a cheap psu   http://www.microdirect.co.uk/(3649)400W-P4AMD-quiet-PSU-with-PFC-20-pin-24-pin.aspx or a more upmarket more powerfull http://www.microdirect.co.uk/(11879)ThermalTake-TR2-500W-Black-Silent-ATX-12V.aspx the choice is yours.

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