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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
  • 1,067 Answers

12 v conecter pluged in also

Posted on Jan 31, 2008

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  • 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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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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If the processor is an AMD, remove cbattery and clear BIOS, and then try again.

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Bad Power Supply, sscorbett.

Usually you have enough power to light LED lights, (Like the harddrive activity LED light for add-in cards, that you see on the motherboard), and spin fans, but Not enough power to turn the Processor on.

Dell Support >Dimension 8400 > Service Manual

http://support.dell.com/support/edocs/systems/dim8400/SM/index.htm

Technical Overview > System Board Components

http://support.dell.com/support/edocs/systems/dim8400/SM/techov.htm#wp1052739

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1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

Your Power Supply just has enough power to light that LED light.
Weak voltage power rail.
Replace the Power Supply.

[ There are three power rails inside that SMPS.
Switched-Mode Power Supply.

1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail ]

The ATX form factor for a Power Supply refers to the size, and shape of the case, for one.
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The ATX power supply case in the Dimension 8400 however, is shorter in length.
It is 4 inches Long. (Depth)

Not an advertisement for the website, nor manufacturer.
Reference for the case size, and power cables needed,

http://www.cputopia.com/hp-400w-dell-dimension-8400.html

Scroll down to see the connectors of the various power cables needed.

You may have a Power Supply with these dimensions, and needed power cables, in an unused computer.
Perhaps someone has upgraded to a better computer, and has an unused computer that you can temporarily borrow the Power Supply for a test unit.

Make sure it has at least 250 Watts (Maximum rated wattage), plus,

1) 20-pin ATX main power cable. (Or a 20 + 4-pin ATX main power cable)

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

[ 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4 ]

2) 4-pin ATX +12 Volt power cable

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

Plus the various power cables needed for the Harddrive, optical drive/s, and computer case fan/s, if it/they do not connect to the motherboard.

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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.
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Good luck and thanks for using FixYa!!

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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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