For my fellow gamers out there, here is a little guide to help you understand error codes and LED signals displayed by your Xbox. Hope this is useful...
Xbox Error Codes
"Xbox needs service" error codes explained:
1 - bootldr - Unknown exactly, something to do with checking the motherboard
2 - bootldr - Eeprom check failed
4 - bootldr - Ram check failed
5 - Kernel - HDD not locked (the retail BIOS require the hard drive to be locked)
6 - Kernel - Cannot unlock hard drive
7 - Kernel - Hard drive timeout
8 - Kernel - No hard drive found
9 - Kernel - Hard drive parameters incorrect, certain size minimum is required for debug)
10 - Kernel - DVD timeout
11 - Kernel - No DVD Found12 - Kernel - DVD parameters incorrect
13 - Kernel - Dashboard launch fail and the dashboard didn't specify why it failed.
14 - Dashboard - Error loading dashboard (dashboard generic error)
16 - Dashboard - Other files to do with dashboard / dashboard settings (specific dashboard error)
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
Status LED and other Errors
Below are the most common causes and fixes for the various flashing LED Signals.
GREEN/RED Flashing: Most probably a bad chip or bad BIOS
SOLID GREEN/No EJECT/No AUDIO/No VIDEO: Normally means a bad solder point. Check all your points again. No Video on with the Xecuter 3 means pins 13 and14 aren't done correctly. It could also be a heat problem, be sure that you haven't forgotten to reconnect your fan and don't put your xbox near heat sources.
SOLID GREEN/No AUDIO/No VIDEO: This is probably a problems with your audio settings. Try to boot your xbox with a standard a/v pack instead of a HD pack.
ORANGE/GREEN Flashing: No AUDIO/VIDEO (A/V) pack. This can also be caused by solder splash on the main board or a damaged track.
ORANGE Flashing: Several possibilities here, either solder splash, damaged track or overheating.
GREEN for half a second then RED Flashing: Corrupt or Empty Eeprom.
SOLID RED: System overheated or hardware failure
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