Question about Dell Dimension 8400 PC Desktop

4 Answers

Woes with Dell

Have got a dead Dell 8400 Dimension. Symptoms include permanent amber power light, air extractor fan that sounds like it is going to take off.
Spoke to a Dell engineer, he suggested power supply problem.
Changed power supply, still the same problem.
Any ideas?
Yours Bemused.

Posted by on

4 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: Woes with Dell

I am having the same problem and found this old link. It may or not be helpful.

Posted on Jan 22, 2008

Re: Woes with Dell - Dell Dimension 8400 PC Desktop PC Desktops

For a while.

Posted on Jan 14, 2008

Re: Woes with Dell

Done all of above, no joy

Posted on Jan 14, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 1,601 Answers
Re: Woes with Dell

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

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Dell 8400 a c diagnostic lights on amber


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.

Oct 28, 2012 | Dell Dimension 8400 PC Desktop

1 Answer

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.

Jul 27, 2012 | Dell Dimension 8400 PC Desktop

1 Answer

Dell dimension 8400 won't turn on

Sounds like you might have a Bad Processor, Take it to a shop, don't tryh to fix this one yourself

Mar 11, 2012 | Dell Dimension 8400 PC Desktop

1 Answer

Dell 8400 dimension desktop on start up the fan runs at top speed like a jet engine taking off, and power light is constant amber with a blank screen. I have removed ram and grafics card etc and replaced...

Your power supply or motherboard has a problem. You can try getting a power supply on the internet ( $25 to $75) first. If no go then motherboard (about $100 to $200 ). The 8400 is about 6 years old which is the average lifespan of computers. One last thing you can try is removing the heatsink assembly and re-seating the processor. You have to clean the old thermal compound from the CPU chip and heat sink and reapply the compound (thermal paste). You might be better off buying a new computer from Walmart.

Feb 26, 2011 | Dell Dimension 8400 PC Desktop

1 Answer

My 6 year old Dell Dimension 8400 quit working completely.

Depending on the symptoms, you may have different faults.
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)

Feb 05, 2011 | Dell Dimension 8400 PC Desktop

1 Answer

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

The POWER and DIAG LEDs can give you information. If no DIAG LED look at the POWER LED
Flashing amber, most likely the power supply
Solid Amber, motherboard or item plugged into the motherboard (Expansion card, external connection etc.)

Apr 17, 2010 | Dell Dimension 8400 PC Desktop

1 Answer

I have been getting beep codes with no monitor and the codes suggest reseating memory. I've done that and now my fan runs really fast and the power buton is amber with still no monitor

The amber light means hardware failure, you'll have to figure out which hardware failed.

If you would like to ship it to me to be repaired, contact me at

Nov 06, 2009 | Dell Dimension 8400 PC Desktop

1 Answer

Dell dimension 8400 will not start.

no man try to take out the modem ( last pci slot on the botom of the board) and see if you have any luck if not you going to need a new motherboard thanks and good luck

Oct 11, 2009 | Dell Dimension 8400 PC Desktop

2 Answers

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

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

Apr 04, 2009 | Dell Dimension 8400 PC Desktop

2 Answers

Dell Dimension 8300 flashing amber power light and dead pc

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

Aug 08, 2008 | Dell Dimension 8300 PC Desktop

Not finding what you are looking for?
Dell Dimension 8400 PC Desktop Logo

579 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dell PC Desktops Experts


Level 3 Expert

5660 Answers


Level 3 Expert

18258 Answers

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

Are you a Dell PC Desktop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides