Question about Dell Dimension 8400 PC Desktop

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Burned pins on psu

Hi when my dell 8400 went dead i decovered 2 pins from the 4 pins on the psu connector is badly burned looking at the connector on the mb there is slight burn damage would the mb also be fried now do i get a new psu and discover the mb is also fried and possibly other damage. would be greatfull for any asst recom

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The reason for the melting could be down to one or the other, i would deffinately change the motherboard as it may be the reason for the melting and just keep an eye on the PSU

Posted on Sep 25, 2007

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Posted on Jan 02, 2017

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8400 dell hold power switch to get started


If it still acts up, compare wiring of the large motherboard Molex connector to the original. Dell used a variant that does not interchange. The enable wire is in a different location from standard ATX location.

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

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Power button on dell 5000 flashing amber


***I'm pretty sure your power supply is dead, you will either #1 take to repair shop or #2 replace it yourself.

The Best Value 550W Gold PSU 12cm 24-Pin 550 PSU is compatible.

The Corsair Memory 550W VX PSU is compatible and Corsair is an excellent brand, but you may have an issue locating the excess power connectors inside the case.

The Xilence XP480-12R Power 480W Quiet PSU would be fine, providiing the "hard drive connectors:2', are 4-pin Molex connectors.

Aug 04, 2011 | Dell Dimension 5100 (D51L1) PC Desktop

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Compaq presario sr2011wm desktop push power on button and the computer won't come on. tried unplugin powercord and waiting for ten seconds and still didn't come on and I've tried removin and restalling...


the psu is bad.
the test is easy , one jumper wire prove PSU bad.
if its fan is dead, (and all fans )

jump pins 16 to 17 (power on pin jumped to ground 17)
connector pulled, turns it on.
see here. and why

http://www.pcdied.com/power.html#Jumper

Sep 16, 2017 | HP Compaq Presario SR2011WM PC Desktop

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Compaq Presario Media Center SR1750NX - Will not come up. Fan starts on high and stays there. No Keyboard lights flash. No monitor. No beeps. Replaced memory, disconnected harddrive, tested and then put...


the PSU has fan, does it spin and blow.
Seems to me. the PSU is bad. 5/12 is ok but there 20/24 pin connector is way more important that that legacy 4 pin .
my guess is the Cd driver ejects ok.

re-seated memory , i guess. (tried 1 at a time is the way !)
tried in bank 0 (lowest number) one at a time.

the voltage are here, do the bench test on it , all power pins.
see that 3.3v?
unplug it, jumper wire the correct 2 pins
pin 16 to 17 on modern PCs (24pin)
your PSU stays on, but some have really poor power checks.
so the unstated SCREEN , with power on last.
shows, no SIGnAL, no sync, warnings.? (or out of range)
no text ever. on said screen.
what video card is there, or is this onboard video.,
on mobo direct vga jack? yes it does but is there a addin video card there.? count VGA jacks, 2 means it has adding card.
onboard is here.
ATI Radeon Xpress 200 shared video memory (UMA)


http://www.pcdied.com/power.html


I think the PSU is bad, one other way it can go bad is to
incorrectly time the Power _OK pin, timing.(output)
see this many times, this pin tells the mobo power is ok.
if it sticks at ok, the Mobo can not function, if this pin lies.
the PSU tells the mobo power is ok
then if the mobo power regs fail, then the mobo sends
Power_on to false and the PSU shuts down.
in your case the Power_ok seems stuck ok. falsely.
or can be.
the thing to know is the power regulators are in the PSU and the MOBO, and both must be good.
or it will be dead.
we bench test all PSUs
and even swap them , to be sure it is ok,
if yes, ok then the mobo is bad (if all loads removed first)
all hdd,/dvd/cd drive. out. (cables pulled)
all addin cards removed ! all of them. if present (look for them)
all memory out and put back 1 by 1.
RIP MOBO

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1 Answer

Can not get computer to power back up no lights on front o rear just little light on mother board have dell 8400


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

harddrive activity light for add-in cards (SCSI LED)

The Dimension 8400 comes with an ATX style of Power Supply, that has a maximum rated Wattage of 250 Watts.
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.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.
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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1 Answer

Looking for power adapter


hard to find.
but u can use 12v DC supplier with that connector line from the dead PSU.

it is a 4-pin connector, but only 2 wires ( positive & negative ) in the line cable.

Oct 28, 2009 | EliteGroup EZ-BUDDIE (ezbuddiep4) Barebone

1 Answer

Replacing a power supply.


Hi,

You need to connect both 20-pin and 4-pin connector to *********** board. Your 4-pin connector is located between your CPU and a I/O connectors.

If you did it right first time, check if you have anything shorted on your board because your old P/S could go bad for reason.

Good luck!!!

Jun 20, 2008 | EliteGroup K8M800-M2 Motherboard

1 Answer

I am trying to update my dell dimension 8400.


Re-Check your power connectors to the main board. mainly the 24-pin EATXPWR conncetor is seated right. Looking at the CPU & to its left there is a 4-pin ATA12v connector which must be connected. Bottom line recheck all internal power connectors.
Lastly there is a red slide switch on the back of PSU, make sure it is set to 115V.
Chances are something is loose. The motherboard manual for your board is a big help.

Dec 12, 2007 | ATI All-In-Wonder® 2006 Edition RADEON®...

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