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Motherboard The computer would occassional shut down. The screen goes to sleep mode. Noticed also the harddrive would still be on. Left the computer as is for some time. (about six months) Then had a real close look at the motherboard and found 1,500 mF caps (about seven of them) around the CPU bulged and dried up electrolyte on the top of the caps. This could have contributed to the supply being loaded and shut off to certain part of the board, quite possibly the processor. I am looking for a new board. The HP support site gives the description of the board as P4G-LA (Corolla) for the US/CAN market. But the actual board in the computer is TriGem 129504 (Imperial). I can not locate the supplier nor the factory. Can somebody please help. Thanks narashprasad@sbcglobal.net narashprasad@sbcglobal.net

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  • Anonymous Mar 14, 2008

    Same problem, swollen and leaking capacitors. Motherboard needs to be replaced. Have not been able to find recommended replacement.

  • Anonymous Jul 26, 2008

    Same problem, where to find new motherboard?

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Hi, this is an indication of a power surge possibly from a near by lighting strike. Always use a surge protection board. The best solution for another motherboard is to Replace it with a generic brand, if you have any doubt about the size format of the board then buy a mini ATX board and you will find this will fit any case, you do not need to buy the exact same motherboard as the orriginal one. Just make sure your Ram and CPU are the same type as needed on the new board. ie:- socket 775 CPU and DDR RAM or whatever your current board uses.
Regards mistyman

Posted on Feb 23, 2008

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My dell dccy will not power on. It was working fine and was powered off but will not power back on. I have checked the power cord. I have opened the case and reseated all connectors. Pushing the power on...


Yes, it's called bypassing the Power On switch. Has nothing to do with the switch itself, or it's wires.

You use a jumper wire on the 20 or 24-pin ATX main power cable's connector.
Touch the jumper wire from the Green wire (Soft Power On) to ANY Black wire. (Ground)
(Soft Power On is abbreviated as PS_ON)

If the Power Supply comes on, the problem is the Power On switch.
If the Power Supply does Not come on, the problem is the Power Supply.

1) 20-pin ATX main power cable,

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

2) 24-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

Look at the photos of the ATX main power cable plugged into the motherboard.
Where the wires go down into the connector is the Back of the connector.

This is where the jumper wire goes down into.

The jumper wire goes down into the socket hole, in the Back of the connector, RIGHT NEXT to the wire IN the socket hole.
The jumper wire has to go pretty far down in the socket hole.

[ATX power cable plugged into the motherboard, Power Supply plugged into power ]

At the end of every wire in the ATX main power cable's connector, is a metal terminal.

A Female Molex Crimp Terminal connector,

http://www.alibaba.com/product-gs/336134982/molex_female_crimp_terminal_connector/showimage.html

[You can click on the Zoom In icon { + } at the top to enlarge the view]

The jumper wire Must touch that metal terminal.
The jumper wire is made from a straightened out paper clip, bent into a U shape.
The middle of the U is wrapped a few times with Black plastic electrical tape.
This where your fingers hold onto the jumper wire.

(One wrap of Black plastic electrical tape is good for 600 Volts DC)

One 'leg' of the U shaped jumper wire goes down into the socket hole with a Green wire.
The other 'leg' of the U shaped jumper wire goes down into ANY socket hole with a Black wire.
(ALL Black wires are Ground wires)

The contact period made is no longer than 2 seconds.

The Voltage is 5 Volts DC.
Two flashlight batteries produce 3 Volts DC.

This is one generic ATX power on switch that I have found fits many computers,

http://www.directron.com/atxswitch.html

NOTE*

WATCH IT when buying an aftermarket Power Supply for your computer, if it needs one.
For a time period Dell was strictly a Proprietary computer manufacturer.
Dell wanted THEIR parts used in THEIR computers only.

They had the motherboard manufacturer switch the pins around in the ATX main power cable connector, on the motherboard.
They also had the Power Supply manufacturer switch the power cables around in the Power Supply.

This means if you plug an ATX main power cable, from an aftermarket Power Supply, into one of these proprietary Dell motherboards, you WILL fry out the motherboard!

Can also fry out the Processor, Ram Memory, and Harddrive. (Plus a graphics card if you have one installed)

CHECK the color code of the aftermarket Power Supply's ATX main power cable, to the color code of the Dell power supply.

See that the color code of the wires matches the socket holes in the connector.

Have further questions regarding this, post in a Comment.

Regards,
joecoolvette

Nov 29, 2010 | Dell Computers & Internet

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.

Oct 21, 2010 | Dell Dimension 8400 power supply ** FREE...

1 Answer

I left the amp in on in Normal mode (not Tube Drive) and the amp shut down. It clicked and no power. I unplugged it for a few minutes and plugged it in and it is is good. No blown fuse. Then after about 3...


Replace your PSU then test all leads that are attached to your hard drive sounds like a faulty lead of some sorts then
try replacing all the leads that attach to your hard drive including electrical extensions + IDE,SATA and the ones that attach from your motherboard to hard drive
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty because a computer has to have an end to the circuit any fulty leads will lead to no boot up
good luck

Sep 15, 2010 | Computers & Internet

1 Answer

Hello can you tell me if this problem concern the power supply


Check your VGA cables to make sure it's properly connected (if you haven't already). If that does not work, Take the CMOS battery out of your motherboard and leave it out for a minute, then put it back in. If that still doesn't work, make another post with more specific information about your system.

Mar 12, 2009 | Okia (OKIA550WP4PS) Power Supply

1 Answer

Compaq presario desktop computer sr1130nx on/off switch


To trouble shoot this problem,I would open the case and make sure the cable are tight from the power switch to the motherboard, you can do this by sliding off the front of the case.

Once the front case is off you should be able with a pen or pencil push the switch slightly to turn it on. But watch and see is how far down the on/off switch goes in.

Jan 21, 2009 | Compaq Computers & Internet

1 Answer

Problem with power supply


The motherboard might be shot would be my guess.

Nov 02, 2008 | Apple Power Supply 344 Watt PowerMac G4...

1 Answer

Orange light on instead of green light..also 3 and 4 number light up


When I first started repairing things a mentor said always unplug anything you are working on. I found this to be a number one rule. You just don't know what still has power even though it says it's off. I've made this mistake too by not checking.
Okay. So...
Hopefully the power supply is just shutting down due to a drain on it's voltage and will be okay. Take out whatever you tried to install. Try it again. Take out anything not necessary to boot your computer. You'll need the video card if not integrated. If you have a bootable floppy, Unplug the hard drive. See if you get to a screen where you can go into the bios setup mode. You also might want to write down where things go back. This is especially if doing this with little sleep. Let me know..'ask me.'

Sep 14, 2008 | Computers & Internet

1 Answer

Computer shuts down


Could be the power supply,Try changing the power supply

Jul 12, 2008 | Computers & Internet

1 Answer

Computer shuts down and reboots at random


the motherboard is going out. when it goes out all the way you will need a new power box and mother board

Nov 09, 2007 | HP (152769-001) (152769001) 250-Watt Power...

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