A,B,C lights are green and D light is yellow what does this mean?

You have to compare to the respective advanced diagnostic codes particular to your machine, to find your answer.  Unfortunately, you didn't include your computer model, so the specific link cannot be  provided.  Go to Product Support (upper left hand side of page) > User Guides > Systems > Dimension Desktops > [Your model] > System Codes/Messages. 

HTH,:smileyhappy:

B4runo

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DIMM 4400
BIOS – A06, date 6/12/02
Win XP Home Edition, SP2
Pentium-4 2.8 GHz, 400MHz FSB, 512K L2
1 GB DDR SRAM PC2100
80GB WD 7200RPM, 200GB WD 7200RPM EIDE/ATA HDDs
Iomega 80GB USB 2.0 External HDD
Pioneer DVR-109BK, Samsung DVD-ROM SD-616R
XFX GeForce FX 5700LE 128MB DDR 8X AGP w/ TV & DVI
17”, 1702FP Digital Flat Panel Display
PCP&C Turbo-Cool 425 Deluxe Dell PSU
SIIG US2275 USB 2.0 / 1394a / NIC PCI card

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Courteous Dell Community Forum members search first, then post.

Have you changed anything in the system lately... any hardware upgrades?

It sound like you might be having problems with your hard drive... those lights indicate a problem booting after the post is complete....

The system does not have a pci express slot.... just standard pci.... I guess it wouldn't make much difference because a pci express card wouldn't fit in a standard pci slot anyway. Try to install the nic in another pci slot and see if that makes a difference. The is no way to disable the slots unfortunately. It could be that there is damage to the motherboard causing that error to appear.

Yea.... as you have probably already found out, most of Dell's consumer support is outsourced mostly in India. That is why you get a lot of hang ups and people not willing to help.. although there are some good techs as well. Dell doesn't worry too much about their cosumer support seeing as how they only make up a small percentage of their sales. That is why the consumer support is outsourced and the buiness support is not.

Keep trying maybe you will eventually get a hold of a helpful tech.l

Here is the link to the documentation for your system: http://support.dell.com/support/edocs/systems/dim8400/SM/adtshoot.htm#wp1052387 .  In your response postings it is somewhat unclear if you have found and followed the revelant diagnostic light code, I would suggest that you attempt to follow all of the suggested resolutions.

There is a time and place for editorializing, and there is a time and place for getting your machine working again.  Your call.....:smileywink:

hi Neyonda,

this is the second crosspost you make on the same subject.

Please don't do that. The real helpers read your post, and will help if they can.

Did you post your problem in the customer support forum, like i advised ?