Question about Dell Dimension 8400 PC Desktop

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Dell 8400 a c diagnostic lights on amber - Dell Dimension 8400 PC Desktop

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  • Henry Clarke Oct 28, 2012

    I have taken out all cards and unplugged power to all disk drives etc.. I know that Dell says check your video card, but replaced it with a working card...same diag lights are on, a and c.

  • joecoolvette
    joecoolvette Oct 28, 2012

    I'm just curious Henry. Have known to be good, compatible Power Supply you can borrow for a test unit? As for power usage, the Processor smacks them all in the dirt. Disk drives use about 10 to 15 Watts of power. A typical Processor can use 51 to 125 Watts of power. (If ALL of the LED lights were on at once, they would use less than 1 Watt of power. EACH fan uses 2 to 3 Watts of power)

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  • 295 Answers

Henry,

The Amber A and C signifies a failure to post. Computers Post BIOS to Processor, then RAM, then back to Processor before initializing the other devices. Try reseating the RAM or replacing it before you go further.
If you have upgraded the devices within the PC recently, you should consider that you should not be running anything less than a 350W power supply.

I hope this helps.

Posted on Jun 23, 2014

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Posted on Jan 02, 2017

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SOURCE: Dell Dimension 8300 flashing amber power light and dead pc

it seems *********** board is having problem plz send it for servicing

Posted on Aug 08, 2008

whitebirch
  • 433 Answers

SOURCE: [Ithr]checkpoint failure dell 8400 dimension

What can cause this error?

Well, this is the problem since quite a variety of problems can trigger the error.

1: the bios can be malfunctioning (a bios reset or flash can give a solution)
2: the cpu can be malfunctioning (this requires a new cpu)
3: the cpu socket can be failing (this requires a new mb)
4: the problem can be with bad usb sockets
5: even a bad uplink to a usb hub can cause this error to appear.
Did you change your monitor lately? I would chase down the USB things first...that and the monitor seem to trip the trigger...
Hope this get you started- I think you were right on target with the flash of the BIOS-try it again using the BIOS flash downloaded from the dell site...and to run the chipset again...it just might
Good luck my friend, hope this helps, please leave rating, thank you kindly

Posted on Apr 27, 2009

  • 1 Answer

SOURCE: Dell 8400 steady amber light, no diagnostic LEDs, high turbo fan

I have this problem with my 8400 also. After lengthly research, it appears that bad capacitors on the motherboard is the overall consensus to the cause of the problem. If you look for caps that have swelled and in some cases leaked electrolyte (a brown/tan color) you might fine your problem. You can replace the bad capacitors if you are comfortable with doing it or replace the motherboard.

Posted on May 01, 2009

ajx13
  • 110 Answers

SOURCE: Dell dimension 2400 blinking amber light

1. Remove All External Devices
2. Check the Computer's Power LED
3. If the power LED has not changed unplug the Power Cable From the Computer Disconnect All Hard Drive Power and Data Cables and power on the computer. If still no go.
4. Remove All PCI, PCI-E, and AGP Expansion Cards .
5. Remove All Memory From the Computer
6. Reseat the ATX and 12-Volt Connections . The ATX connector will be a 4 pin square connector connecting to the motherboard from the power supply and the 12-Volt Connection would be the biggest connector with a lot of colored wires.
7. If still no go.
8. Disconnect the Power Connection to the Chassis Fan
9. If the light still flashes then it could be a power supply or motherboard failure. Try a good know power supply first and if that does not fix the problem it is the motherboard. Also check the back of the tower for 4 lights lables ABCD or 1234.
Rate if useful.

Posted on Aug 11, 2009

  • 1 Answer

SOURCE: Dell dimension 5150 blinking amber lights

Perhaps the problem is on a daughter card that sits just behind the power button. The daughter card has a part number on it "TOPSEARCH ts-m-8v01c". The card has a mic jack, a headphone jack, two USB ports, the power switch itself, and LEDs which light up the HDD icon and some numbers on the front of the PC. On the one I am fixing, the power button is flaky. I am considering replacing the board ($50 or more) and replacing the switch entirely.

Posted on Sep 13, 2009

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Dell dimension 8400 blinking amber light ethernet port


An Amber blinking power button indicates a low voltage problem. This can be caused by a defective power supply or a defective motherboard. Since you replaced the power supply, my guess is that the motherboard has a problem.
Just to make sure that nothing else is causing the problem, remove any PCI cards like modem, video card, sound card, etc... Remove the memory modules and disconnect cables to CD/DVD drives. Look at the USB ports to see if any are damaged.

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Can you tell if your hard drive is running? You can here it or feel it spinning. Are the fans running? If no, I'm 99% sure you need to replace your power supply and/or motherboard. This kind of thing usually happens after a power surge.

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Depending on the symptoms, you may have different faults.
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell
Flashing Amber power LED, normally power supply
AAGG Diag LEDs normally bad RAM
Solid Amber Power LED, bad motherboard or Expansion card connected to it.
If you need a motherboard a Precision Workstation 370 motherboard is essentially the same and is available, (8400 motherboards are scarce)
http://shop.ebay.com/i.html?_kw=T7787&_kw=DELL&_kw=Motherboard

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1 Answer

My dell dimension 8400 canot boot up at all and the Diagnostic Lights not light oso..so wat i can do?


The POWER and DIAG LEDs can give you information. If no DIAG LED look at the POWER LED
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell
Flashing amber, most likely the power supply
Solid Amber, motherboard or item plugged into the motherboard (Expansion card, external connection etc.)

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call dell first tell them the problem,they should help you,or use chat i use that sometimes.

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you will need to change your processor is like it is bad.

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Which fan?, the cpu fan or the cpu fan?

Most Dell pc come with a below average power supply. I recommend replacing your power supply with a better one. Do a search on Google for a good replacement power supply for you Dell 8400.

Please rate response.

Feb 17, 2009 | Dell Dimension 8400 PC Desktop

1 Answer

Dell Dimension 8400 power supply


Hi,
It not a common problem. The problem that you are facing is is beacuse of faulty motherboard. The blinking amber is caused , becasue the motherboard is not able to distribute the power signal to the devices . You can follow the link below to trouleshoot the problem if you are comfortable in opening the computer chassis

http://tinyurl.com/8mkpnm


Thanks
Proton

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3 Answers

Have a yellow amber light blinking


A Blinking Amber or Yellow power button means that the power supply is receiving power from the source but is unable to properly distribute it to the components. This can be caused by a defective power supply or a defective motherboard. Just to make sure that nothing else is causing the problem, remove any PCI cards like modem, video card, sound card, etc... Remove the memory modules and disconnect cables to CD/DVD drives. Look at the USB ports to see if any are damaged.


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If the power light is steady amber, a device might be malfunctioning or incorrectly installed.

Disconect fan , see if it starts.

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