Just adding this news for all those newbies getting error codes all the time.. Its also good for me too.. Im getting forgetful in my old age.. hehhe lol

Instructions:
If you have encountered one of these service errors:
- look up the code in the list below
- read the info
- read the solution (very important )
- if possible, read any related topics


Service Error 00:
Info: This can be any error, this shouldn’t occur though.
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 01:
Info: Motherboard error.
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 02:
Info: EEPROM check failed.
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 03:
Info: Unknown (or not used).
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 04:
Info: RAM check failed.
Solution: None
Related topic(s) on Xbox-Hq.Com: none


:Service Error 05:
Info: Your Xbox Harddrive is not locked. A retail BIOS needs a locked Harddrive. You will receive this error only when turning off your modchip and booting to the retail M$ Dashboard.
Solution: Use "ConfigMagic" to lock/unlock the Harddisk ("ConfigMagic" can be found on the "HQ Auto Installer Deluxe Installer v1.01" ISO).
Related topic(s) on Xbox-Hq.Com: none
Related link(s): http://aid.xbox-hq.com



Service Error 06:
Info: Cannot unlock Harddisk. This means that the key you put in (when you locked it) was invalid.
Solution: Check the IDE Connection/Cable and check the Power Supply.
Related topic(s) on Xbox-Hq.Com: none


Service Error 07:
Info: Harddisk timeout.
Solution: Check the IDE Connection/Cable and check the Power Supply.
Related topic(s) on Xbox-Hq.Com: none


Service Error 08:
Info: No Harddisk found.
Solution: Check the IDE Connection/Cable and check the Power Supply.
Related topic(s) on Xbox-Hq.Com: none

Service Error 09:
Info: Harddisk parameters (PIO/DMA/or size). Certain minimum size is required for a debug BIOS. According to llamma.com, error code 09 means "Xbox motherboard is having trouble communicating with the Hard Drive...this is probably due to an ATA controller on the motherboard and not due to the hard drive itself." When the error screen appears, the light around the eject button flashes red instead of green. The disc tray will not open and the system will not boot up at all. You could also have corrupt EEPROM settings. Solution(s): Make sure the jumper is on cable select (the new harddrives have many different options that you can choose depending on the way you set the jumper ..so just check it ,make sure someone didnt get confused. Try replacing the IDE cable. Get EEPROM backup
Related topic(s) on Xbox-Hq.Com: "Error Code 09"


Service Error 10:
Info: DVD Drive timeout.
Solution: Check the IDE Connection/Cable and check the Power Supply.
Related topic(s) on Xbox-Hq.Com: none


Service Error 11:
Info: No DVD Drive found.
Solution: Check the IDE Connection/Cable and check the Power Supply.
Related topic(s) on Xbox-Hq.Com: none


Service Error 12:
Info: DVD parameters (PIO/DMA)
Solution: Unknown (to me, that is)...
Related topic(s) on Xbox-Hq.Com: none


Service Error 13:
Info: Dashboard launch failed (due to missing/bad key, or anything else that would prevent it from running) and the dashboard didn't specify why it failed.
Solution: Lock the Harddisk if not done so. Try updating your M$ Retail Dashboard using the 'HQ Auto Installer v1.01'. or manually download and install one of the 4 different Microsoft Dashboard versions.
Related topic(s) on Xbox-Hq.Com: none


Service Error 14:
Info: Error loading dashboard (dashboard generic error). Solution: Replace the current dashboard with a new dashboard because the old one is probably dead. Boot the 'HQ Auto Installer Deluxe' and re-install your dashboard..
Related topic(s) on Xbox-Hq.Com: none
Related link(s): http://aid.xbox-hq.com


Service Error 15:
Info: Unknown (or not used).
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 16:
Info: Other files related with the dashboard or dashboard settings (specific dashboard error).
Solution: You may have corrupted dashboard files on your xbox hdd. Use the 'HQ Auto Installer Deluxe' to reinstall your dashboard.
Related topic(s) on Xbox-Hq.Com: none
Related link(s): http://aid.xbox-hq.com


Service Error 17:
Info: Unknown (or not used).
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 18:
Info: Unknown (or not used).
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 19:
Info: Unknown (or not used).
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 20:
Info: 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.
Solution: None
Related topic(s) on Xbox-Hq.Com: none


Service Error 21:
Info: 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. This error seems to show up more often when hacking/patching/customizing the original dashboard.
Solution: You probably are running the wrong dashboard for your xbox version. Use the 'HQ Auto Installer Deluxe' to reinstall your Retail M$ Dashboard.. It should fix this error no matter which xbox version you have.. If not try downloading another Retail M$ Dashboard.
Related topic(s) on Xbox-Hq.Com: none
Related link(s): http://aid.xbox-hq.com

You can also view the error code information in the HQ forums where it may be more up-to-date.. :) Check it here: http://xbox-hq.com/html/postt5244.html