Explanation of Error Codes

As this page matures many error codes will include the steps to resolve the problem, click on the individual error code to see the Llamma's page.

Call Customer Service With No Error Number is one of the errors below but the Xbox does not know which one since yours is a launch box with a 39XX bios/kernel (with the 4034 Microsoft added in the error numbers)  You can send these to us to fix or try the resolutions for the errors below and see which one yours is.
Call Customer Service Error with no number but occurs only when trying to load a game or access menu items from dashboard (never on boot up) Call 1800-4MY-Xbox, they will give you a code to enter via a controller to reset the system More Info

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Tutorial written by: Superfro (posted with permission)

Description:
When you attempt to boot, a 'you need service' message comes up, and has a LED style number on the top left hand corner. Here is what they mean.

Disclaimer:
This information is a believed to be correct, should be as close as it gets;
Also:
Bootloader stuff you should never see, since if it fails kernel doesn't boot. (thus you see no message)

Code Who sets it - Description

0 - any - No error (duh)

1 - bootldr - Unknown exactly, something to do with checking the motherboard

2 - bootldr - Eeprom check failed

3 - bootldr - ??/not used

4 - bootldr - Ram check failed

5 - kernel - HDD not locked (retail bioses require the hd to be locked)

6 - kernel - Cannot unlock HDD

7 - kernel - HDD timeout

8 - kernel - No HDD found

9 - kernel - HDD parameters (PIO/DMA/or size {debug}, certain size minimum is required for debug)

10 - kernel - DVD timeout

11 - kernel - No DVD Found

12 - kernel - DVD parameters (PIO/DMA)

13 - kernel - Dashboard launch fail (due to missing/bad key, or anything else that would prevent it from running) and the dashboard didn't specify why it failed.

14 - dashboard - Error loading dashboard (dashboard generic error)

15 - - ??/not used

16 - dashboard - Other files to do with dashboard / dashboard settings (specific dashboard error)

17 - - ??/not used

18 - - ??/not used

19 - - ??/not used

20 - kernel - The dashboard was attempted to load and failed; It was a cold boot, and the dashboard didn't specify why it failed, but it (for some reason) needed to be noted that the dvd passed the challenge/response authentication

21 - anywhere - This error says that the machine was booted to display a error, basically someone told the machine to reboot (or launch a xbe) with this flag, and the error code just means its been rebooted by the flag

In closing:

21 was the highest number I could find, I don't think any thing is past that. And for the unknown ones, I couldn't find any reference to them at all, I don't believe they are used.

Greets to everyone (who is contributing) in the homebrew scene.

Tutorial written by : Superfro

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Here is an example of an error code note the white number 7 in the upper left.  

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