Dell XPS 420 1-3-4 error code.

The computer is in a normal off condition or a possible pre-BIOS failure has occurred.

The diagnostic lights are not lit after the system successfully boots to the operating system.

• Plug the computer into a working electrical outlet (see Power Problems).
• If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell>).

A possible processor failure has occurred.

• Reseat the processor (see Processor).

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• If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell>).

Memory modules are detected, but a memory failure has occurred.

• If two or more memory modules are installed, remove the modules (see Removing Memory)<ADMIN NOTE: Broken link has been removed from this post by Dell>
  , then reinstall one module (see Installing Memory)<ADMIN NOTE: Broken link has been removed from this post by Dell>
  and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
• If available, install working memory of the same type into your computer (see Installing Memory).<ADMIN NOTE: Broken link has been removed from this post by Dell>
• If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell>).

A possible graphics card failure has occurred.

• Reseat any installed graphics cards (see Cards).<ADMIN NOTE: Broken link has been removed from this post by Dell>
• If available, install a working graphics card into your computer.
• If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell> ).

A possible floppy drive or hard drive failure has occurred.

Reseat all power and data cables.

A possible USB failure has occurred.

Reinstall all USB devices and check all cable connections.

No memory modules are detected.

• If two or more memory modules are installed, remove the modules (see Removing Memory),<ADMIN NOTE: Broken link has been removed from this post by Dell>
  then reinstall one module (see Installing Memory)<ADMIN NOTE: Broken link has been removed from this post by Dell>
  and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
• If available, install working memory of the same type into your computer (see Installing Memory).<ADMIN NOTE: Broken link has been removed from this post by Dell>
• If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell> ).

Memory modules are detected, but a memory configuration or compatibility error has occurred.

• Ensure that no special requirements for memory module/connector placement exist (see Memory).

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• Ensure that the memory you are using is supported by your computer (see Memory).

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• If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell> ).

A possible expansion card failure has occurred.

1. Determine if a conflict exists by removing an expansion card (not a graphics card) and restarting the computer (see Removing a PCI Card

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   and Removing a PCI Express Card).

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2. If the problem persists, reinstall the card you removed, then remove a different card and restart the computer.
3. Repeat this process for each expansion card installed. If the computer starts normally, troubleshoot the last card removed from the computer for resource conflicts (see Troubleshooting Software and Hardware Problems in the Microsoft Windows Vista™ Operating System).
4. If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell> ).

Another failure has occurred.

• Ensure that all hard drive and optical drive cables are properly connected to the system board (see System Board Components).

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• If there is an error message on the screen identifying a problem with a device (such as the floppy drive or hard drive), check the device to make sure it is functioning properly.
• If the operating system is attempting to boot from a device (such as the floppy drive or optical drive), check system setup (see System Setup)

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  to ensure the boot sequence is correct for the devices installed on your computer.
• If the problem persists, contact Dell (see Contacting Dell <ADMIN NOTE: Broken link has been removed from this post by Dell> ).

1-3-1 through 2-4-4

Memory not being properly identified or used

4-3-1

Memory failure above address 0FFFFh