Although It Is Believed That Much of This Information Is Accurate, We Will Not Be Held Liable for Any Damages to Your Xbox 360 Incurred by Using This Information

Error Data———>
If there is an issue with the Xbox360 The LEDs in the ring of lights will flash in a distinct pattern. The pattern itself helps shed some light to the issue.  Individual patterns will correspond to numbered error codes that can provide more insight to the problem. The numbered error codes are detailed below their corrosponding LED codes.

Please contribute if you know of new codes that are not part of this list.

Sections 1, 2, 3, and 4 are flashing red
- The AV cable cannot be detected

 Steps to Try

   1.  Ensure that the AV cable is correctly attached to the Xbox 360 console.
   2. Un connect the AV cable from the Xbox 360, then reconnect the AV cable to the Xbox 360 console.
   3. If the four flashing red lights keep flashing, try cleaning the metal area of the AV pack using a dry cloth. The metal portion is the end that plugs into the console. Clean the metal area completely, and then try the AV Pack once again.
   4. If the AV cable is connected properly but the four red lights are flashing still, try a new AV cable.

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Sections 1, 3, and 4 are flashing red
- General Hardware Failure

Click for this Xbox repair guide  If you are getting the 3 Red Light Error (AKA Three Red Lights of Death, 3RLOD, Red Ring of Death, X-Clamp Fix) This link has the information you need!!

Check out the secondary Error Code following the instructions within the below section:

Try This

   1. Restart the console.
   2. If restarting the console doesn't stop the behavior, try these steps:
          * Power the console off.
          * Unplug all power and AV cables.
          * Unplug the power cable from the wall outlet.
          * Solidly reconnect all cables.
          * Restart the console.
   3. If these steps don't fix the problem, power the console off, take out the hard drive, and then power up the console. If the 3x Red LED error light is gone, turn the console off, re-attach the hard disc drive, and then power on the console.
   4. Study the lights on the power supply. Initially, the power supply light should shine green light  even if the three lights on the RoL are flashing red.
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Sections 1, and 3 are red in flashing
- Overheating

Overheating can be a cause of the console locking up or "freezing" after a certain time period. Lockups that  happened at a specific point in a game often are normally issues with the game console itself and Is not caused by your game console overheating.

Try This

1. Let your game console cool down.

2. Ensure that the game console has adequate ventilation and that the cooling fan is functioning.
   

PREVENTION SUGGESTIONS
To attempt to fix this issue, use the following steps:

• Don't obstruct the ventilation openings on your Xbox console.

• Don't place your Xbox console on your bed, on a sofa, or on any  soft surface that can block the ventilation openings.

• Never place the Xbox 360 console in a cramped space, like a bookcase, a rack, or a cabinet, unless the area is ventilated well.

• Don't place your console close to a source of heat, like a radiator, a stove, heat register, or other electronics.
  

Don't Put Your Xbox in the Refrigerator

Some individuals believe that this could help "repair" an overheated game console,  doing so might create more problems. Electronic devices like your game console are designed to work at and around room temperature, very cold temperatures can  create as many problems as a varying warm temperature (like overheating).

Additionally if your game console is plays in a super frigid area while It is running, the temperature difference between the cold air and hot console will make condensation which could short out your game console making your situation much worse.

Condensation will occur more rapidly if your game console is overheating because of the increased temperature differential. In short… Do not do it ( pun intended ).

A much more viable answer to overheating is to increase the cooling capacity of the game console. The absolute best solution that you can do is to replace the thermal set compound.

Do this at your own risk. If you're  game console is still under warranty it is recommended that you contact MS for a replacement before attempting to fix it yourself. If you do decide to repair it on your own make sure you use a good Xbox 360 repair guide.

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Section 4 is red and flashing

Hardware Failure

The Type of hardware shortcoming can be determined by the error code that is displayed on the screen.
If your screen is blank or you want more information follow these instructions for discovering the secondary error codes within the below section.

E45: Unknown (possibly related to dashboard update)

E64: DVD Drive Issue…. DVD Timeout, incorrect The firmware, dvd is without f/w chip, etc.

E65: DVD Drive Error…. DVD Timeout, Incorrect firmware, dvd is without f/w chip, etc. This can also be caused by the disc tray not being fully closed on boot.

E66: DVD Drive Error: DVD model, or drive version does not match that of the version expected by the dashboard. OR the firmware version on the drive is older then the firmware version expected by the dashboard.

Make sure the DVD drive is of the same version originally included with the console and that it is using either the original firmware included with the console or newer.

E67: Hard Drive Error… It could be a problem with the Hard Drive itself or a problem with the internal connection to the hard drive, Try removing the hard drive and playing without it

E68: Hard Drive Error… It could be a problem with the Hard Drive itself or a problem with the internal connection to the hard drive, Try removing the hard drive and playing without it, This can also be caused by a Hard Drive Eprom Error. Some also believe this might be caused by a problem with the fans.

E69: Hard Drive Error… It could be a problem with the Hard Drive itself or a problem with the internal connection to the hard drive, Try removing the hard drive and playing without it

E71: possibly a dashboard update error, Check below in the "Console Reset Codes" for instructions. If that does not work there is no other solution and the console must be sent back to MS for repair.

E72: (not yet known)

E73: General Hardware Error: Ethernet port… this error is caused by a problem with the Ethernet port.

E74: AV cable error… There is a problem with the AV cable, try using a different AV cable. If the cable is known to be working then there is a 90% chance it's a scaler chip problem (the "ANA" or "HANA" chip connected directly to the AV cable) in rare cases it is the GPU.

E76: (not yet known)

E79: Hard Drive Error… It could be a problem with the Hard Drive itself or a problem with the internal connection to the hard drive, Try removing the hard drive and playing without it
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SECONDARY ERROR CODES

The particular type of hardware failure can be determined by a "hidden" error code

• Turn the xbox 360 on, and wait till the 3 red lights are flashing.

• Press and hold the sync up button (the small white one), while holding that button press the eject button.

• The LEDs will now blink the first number in the code (as described below).

• Release the eject button and press it
   
• The LEDs will now blink the second number of the code.

• Release the eject button and press it again.
  
• The LEDs will now blink the third number of the code.

• Release the eject button and press it again.

• The LEDs will now blink the forth number of the code.

• Release the eject button and press it again.

• The LEDs will go back to the 3 red flashing lights.
  

You should now be able to determine the difference between the 3 flashing lights and the error code lights by the rate in which they flash.

This is how you interpret the LEDs to get the code number:

    * All four lights flashing – 0
    * One light flashing – 1
    * Two Lights flashing – 2
    * Three lights flashing – 3

0001 Power Supply problem
0002 Network Interface problem
0003 Power problem could be the PSU could be the GPU/CPU, somehow the console isn't getting clean power from the power supply.
0010 over heating
0011 over heating – If you are receiving this error after disassembling your console make sure to all 8 of the heat sync screws are tightened securely to the board/heat sink holes.
0012 over heating
0013 over heating
0020 (Not yet known, possibly overheating)
0021 DVD Drive Time out – Can be caused by problems with a firmware flash. This is also speculated to sometimes be caused by a problem with the southbridge chipset on the motherboard.
0022 GPU Error / GPU Overheating
0023 (not yet known)
0101 (not yet known)
0102 unknown error

It's quite likely GPU related actually means the console does not know what is wrong. possibly a short or cold solder joint somewhere.

There is 1 major theory for what creates most of these errors and that is that the Ram, CPU, or GPU are not properly soldered to the mother board either do to poor build or excessive heat up and cool down cycles that can stress, weaken and over time break down the soldered connections.

There are two theories to fixing this;

The first concerns the "X" clamps that hold down the chips. The second involves re-Heating of the chips. DO NOT attempt either of these if your game console is still under warranty. If your Xbox 360 is still under warranty return it to the store where you bought it or call MS to have it replaced. Limited success has been reported by simply switching the AV cable from "HDTV" mode to "TV" mode.

0103 CPU Error/ CPU Overheating – see solution for error 0102
0110 Memory Error / Memory Overheating – see solution for error 0102
0200 (not yet known)
1000 (not yet known)
1001 (not yet known)
1002 (not yet known)
1003 Hard Disk Drive Error… It could be a problem with the Hard Drive itself or a problem with the internal connection to the hard drive, Try removing the hard drive and playing without it
1010 Hard Disc Drive Error, Can be caused buy a missing or corrupt eProm.
1011 (not yet known)
1012 (not yet known)
1013 (not yet known) possibly a dashboard update error
1020 (not yet known)
1021 (not yet known)
1022 AV cable error… There is a problem with the AV cable, try using a different AV cable. (could also be a problem with the encoder chip)
1023 DVD drive not connected, connect DVD drive to boot
1030 (not yet known)
1031 (not yet known)
1032 (not yet known)
1033 (not yet known)
1444 and up There is no "4" in the error codes four lights is a "0" go back and check your code again.

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Console Reset Codes
Clear All Installed Game Updates and Console Cache

   1. Go to the "system" blade
   2. Select "memory"
   3. Press Y on the HD symbol
   4. Press X,X, Left Bumper, Right Bumper, X,X
   5. A message will appear saying: "Do you want to perform maintenance on your Xbox 360 storage devices?"
   6. Select Yes

Clear Any Failed system updates that cause the console to error.

   1. With the console turned off, press and hold the sync up button (the small white one)
   2. While holding the sync button press the power button to turn on the console
   3. Continue holding the sync button until the Console has booted up completely.
   4. During the boot process the console should clear any failed updates, allowing you to use it normally.

Xbox 360 Error Codes is a post from: Xbox 360 Support

XBOX 360 Support| Fix your Xbox Save On Support Video Shows How! is a post from: Xbox 360 Support