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Dell dimension 8400 desktop shuts off by itself and power light blinks amber

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Which is a direct indication of a bad Power Supply,

http://support.dell.com/support/edocs/systems/dim8400/SM/adtshoot.htm#wp1053720

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1147665&CatId=1078


http://support.dell.com/support/edocs/systems/dim8400/SM/parts.htm#wp1058213

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

Also clean the inside of the computer out with a can, or two of compressed air for computers. You may find a soft small brush, and Q-tips will help. ('Stir' the Gunk around to 'break the crust', then the compressed air can remove it better)

Power unplugged from computer, ('Natch), and Anti-Static Precautions -> FOLLOWED.

For additional questions please post in a Comment.

Regards,
joecoolvette

Posted on Oct 25, 2012

  • 1 more comment 
  • joecoolvette
    joecoolvette Oct 25, 2012

    Thank you for the rating Jay!

  • jay266
    jay266 Feb 04, 2013

    Tthanks for your help. And the great links

  • joecoolvette
    joecoolvette Feb 04, 2013

    You're welcome Anytime!

×

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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.

Posted on Jan 13, 2008

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SOURCE: Dell OptiPlex GX520 PC Desktop Problem

Hello everyone, check your cpu - I've just had one of these in for repair and the cpu was faulty - removing the ATX 4way 12v lead let the pc start rather then detecting a short and shutting the psu down. Changing the cpu cured the fault.

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Posted on Apr 18, 2009

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SOURCE: Can't boot up Dell 5100 Dimension, amber light flashes

When you mean the amber light, is that the blinking hard drive access light or the power light? Different cases have different colors on it. Mine has blue and green lights.

If you see the boot screen (bios) and then after it goes to boot, does it blink and hang?

This could be a simple operating system issue, hard drive or hardware/motherboard issue. If you could provide more information, that would help.

Posted on Jun 28, 2009

ajx13
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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

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1 Answer

Dell 8400 a c diagnostic lights on amber


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.

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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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Depending on the symptoms, you may have different faults.
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell
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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)
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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
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When you mean the amber light, is that the blinking hard drive access light or the power light? Different cases have different colors on it. Mine has blue and green lights.

If you see the boot screen (bios) and then after it goes to boot, does it blink and hang?

This could be a simple operating system issue, hard drive or hardware/motherboard issue. If you could provide more information, that would help.

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If the power light is blinking amber, the computer is receiving electrical power, but an internal power problem might exist.
Try, unplugging the power cable from the pc, and reinsert it, if this does not help try a differnt power outlet, if this dont help, open the computer, take the power Molex conector out of the mother board and try turning it on, if this dont help, take out the Memory modules and reseat them, if this dont work you may want to ring up dell support.

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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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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.


Your responses are intended to improve the level of service provided. Please show your appreciation by rating your experience.

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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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