i found this on conslespot
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\ /One red light flashes on the Ring of Light: Hardware failure. Restart the console. Contact Xbox Customer Service if the problem is not resolved. If the agent cannot help you resolve this issue, you will have to return the console to Microsoft for repair.
One red light flashes on the Ring of Light and you receive an error message: Hardware failure. Restart the console. Contact Xbox
Customer Service if the problem is not resolved. If the agent cannot help you resolve this issue, you will have to return the console to Microsoft for repair.
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\ /Two red lights flash on the Ring of Light: This behavior occurs when the console is too hot. Power down for a while. Check sufficient ventilation. Verify the cooling fan is working. If the two lights continue to flash red
after you tried the solutions, contact Xbox Customer Service. If the agent cannot help you resolve this issue, you will have to return the console to Microsoft for repair.
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\ /Three red lights flash on the Ring of Light: Hardware failure. Restart the console. Contact Xbox Customer Service if the problem is not resolved. If the agent cannot help you resolve this issue, you will have to return the console to Microsoft for repair.
The specific 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 again.
* 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 be able to determine the difference between the 3 flashing lights and the error code lights by the rate in which they flash.
Here 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 There is a problem with the Southbridge Chip usually dealing with how it connects to the mainboard (cold solder joint/bridged solder joints)
0011 CPU over heating - If you are receiving this error after disassembling your console make sure to all 8 of the heatsinc screws are tightened securely to the board/heatsink holes.
0012 GPU over heating -ensure your x-clamps are installed properly.
0013 RAM over heating
0020 GPU Malfunction, similar to error 0102
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Protip: 0020 is a 
, reflowing is pretty much mandatory unless you want to crack the chip
0021 This can be caused by two completely different things either:
A. DVD Drive Time out - Can be caused by problems with a firmware flash. This is also speculated to sometime be caused by a problem with the southbridge chipset on the motherboard based on how it connects to the DVD drive.
B. GPU error, generally caused by a poor connection to the mainboard (cold solder joints/bridged solder joints) See error 102 for more information
0022 CPU error, generally caused by a poor connection to the mainboard (cold solder joints/bridged solder joints). This can also be triggered by an error with the TSOP.
0023 (not yet known)
0030 Problem with temperature control
As per my experience, 0031 can be fixed by loosening the xclamp screws. Not a fool proof solution though. It's caused by different things.
I had recently experience 0031 by accidentally shorting out something underneath the GPU.
0032 (not yet known)
0033 (not yet known)
0100 (not yet known)
0101 (not yet known)
0102 Error in the "Digital Backbone" (CPU/GPU/RAM), this is usually caused by a cold solder joint between the GPU and the mainboard.
There are two theories to fixing this one deals with the "X" clamps that hold down the chips. The other involves re-Heating the chips. DO NOT attempt either of these if your console is still under warranty. If your console is still under warranty return it to the store where it was purchased or call MS to have it replaced.
[/list]0103 GPU Error this is usually caused by bridged solder points where the GPU connects to the mainboard. see error 0102 for more detailed information
0110 Ram error, this is caused by a cold or bridged solder joint on one of the Ram chips.
0111 is cause by the ram chips i fixed it by reflowing them with a heatgun hope it helps someone
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0200 (not yet known)
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1000 Kernel can't be launched/signature in NAND Flash chip is broken! It could be possible after bad update.
http://forums.xbox-scene.com/index.php?sho...p;#entry4156375 This might also be caused by a bad SATA cable.
1001 DVD Drive Error, either incorrect firmware or DVD Time out.
1002 DVD Drive Error, likely a firmware error, drive can eject, read, and write under windows but errors on console, replacing original firmware should fix issue.
1003 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
1010 Hard Drive Error, Can be caused buy a corrupt or missing eProm. See also E68 above
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 There is high chance it's a scaler chip problem (the "ANA" or "HANA" chip near the AV cable connection) it can also be caused by a faulty AV cable so check that first. In some cases it is a problem with the GPU and may be repairable by doing the x-clamp replacement (see error 0102)
1023 DVD drive not connected, connect DVD drive to boot
1030 This error deals with the Ethernet port's controller chip, a dead chip may not cause the error but removing the Ethernet controller chip does, it may also be caused by other Ethernet related problems.
1031 (not yet known)
1032 (not yet known)
1033 it could be cpu/gpu related or it could be psu related, not much info is known for sure.
1100 Wrong LDV version in NAND Flash. This is in new dashboard. You have the update but haven't R3T6 resistor. You can:
-Downgrade to old dashboard, solder back the resistor and then update your xbox
-If you have CPU Key, get current NAND Flash image and fix LDV (just add 1 up to latest kernel). (see error E80)
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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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\ /Four lights flash red on the Ring of Light: The A/V cable is not correctly connected to the Xbox 360 console. The cable is not being detected by the console. Verify proper installation of the A/V Cable. This error will not occur if the cable is improperly plugged into a TV or VCR. Try another cable. If the four red lights continue to flash after you follow these troubleshooting steps, the Xbox 360 console may have to be repaired.
Contact Xbox Customer Service.
Four lights flashing on wired controller: A wire in the USB cable is broke or something inside the controller is bad. It does have power, but one of the data wires are bad, or the ground is shorting to a data wire. It can be a combination of any of those, but power is present. REPAIR? YES!
You can take any USB cable and splice it into the Xbox360 controller, or replace the cable by cutting the original cable 4 to 5 inches from the controller, and splice in a USB cable. There are only four wires to connect, and they are color coordinated.
Lights on Wireless controller look like they're spinning around: This means the battery needs recharged/replaced. When the controller does shut off Xbox360 halts game process and informs you to reconnect the controller.
You can plug the charger in while playing if you have the play-n-charge kit. If using "AA" batteries they need replaced, and always have a wired controller handy incase you do not have any on hand!
Four lights flashing on wireless controller: It has not communicated with the Xbox360, or Xbox360 did not acknowledge the controller. Replace or charge the batteries. Setup the controller again. The controller is bad, or the wireless system in Xbox360 is bad.
Error Number & Possible Solutions:
E64: DVD Drive Error.... DVD Timeout, Wrong firmware, dvd is without f/w chip, etc.
E65: DVD Drive Error.... DVD Timeout, Wrong firmware, dvd is without f/w chip, etc. This can also be caused by the tray not being fully closed on boot.
E66: DVD Drive Error: DVD model, or 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: Voltage Error... This error means that the Xbox 360 has insufficent power to function properly. This can be caused by an error in the hard drive or the fans that make them suck up too much power, it can also be caused if you have unnecessary accessories attached to the console like an external fan unit. Attempt to remove unnecessary accessories first, and then necessary components such as the hard drive and USB devices. If you have any case mods you may want to investigate those as well.
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: Error with the NAND flash
E73: General Hardware Error: Ethernet port... this error is caused by a problem with the Ethernet port.
E74: There is high chance it's a scaler chip problem (the "ANA" or "HANA" chip near the AV cable connection) it can also be caused by a faulty AV cable so check that first. In some cases it is a problem with the GPU and may be repairable by doing the x-clamp replacement (see error 0102)
E76: This error deals with the Ethernet port's controller chip, a dead chip may not cause the error but removing the Ethernet controller chip does, it may also be caused by other Ethernet related problems.
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.
According to tmbinc: E79 is the error code if xam.xex could not be started, i.e. probably a file system corruption.
E80: Wrong LDV version in NAND Flash. This is in new dashboard. You have the update but haven't R3T6 resistor. You can:
-Downgrade to old dashboard, solder back the resistor and then update your xbox
-If you have CPU Key, get current NAND Flash image and fix LDV (just add 1 up to latest kernel). (See error 1100)
If you suspect a HDD problem, in all cases, remove the HDD and boot the Xbox 360. If it works or runs fine without it, the HDD is defective.
Removing the HDD also puts less stress on the power supply and may only temporarily remedy the problem.
The power supplies and CPU overheating are are the cause of 75% of the problems listed above for the release day XBox 360s. If you suspect a power supply, and you have or know of a console that is not giving errors or other problems like described above; swap power supplies. If the other console fails with your power supply and yours now works - Defective Power Supply.
