Xbox 360: One red light flashes on the Ring of Light and you receive the "E74" error message
SYMPTOMS loadTOCNode(1, 'symptoms');
When you perform an auto update on the Xbox 360 console, and then restart the Xbox 360 console, the lower-right quadrant of the Ring of Light (RoL) flashes red. Additionally, you receive the following error message: E74. System Error. Contact Xbox Customer Support.
CAUSE loadTOCNode(1, 'cause');
This behavior occurs when the Xbox 360 console experiences a hardware failure.
THINGS TO TRY loadTOCNode(1, 'whattotry');
1. Turn off the console, disconnect all the cables, and then reconnect all the cables. Turn the console back on.
2. Turn off the console, and then disconnect any accessories that are connected. For example disconnect any Xbox 360 controllers, Xbox 360 Memory Units, and the Xbox 360 Hard Drive. With the accessories disconnected, restart the console to see whether the problem continues to occur. This can help determine whether the console or an accessory is experiencing the problem.
3. If you continue to experience this problem, contact Xbox Customer Service.
Note If the agent cannot help you resolve this issue, you may have to return the console to Microsoft for repair.Heres what microsoft says about the error I hope this comes out readable. Xbox 360: One red light flashes on the Ring of Light and you receive the "E74" error message SYMPTOMS loadTOCNode(1, 'symptoms'); When you perform an auto update on the Xbox 360 console, and then restart the Xbox 360 console, the lower-right quadrant of the Ring of Light (RoL) flashes red. Additionally, you receive the following error message: E74. System Error. Contact Xbox Customer Support. CAUSE loadTOCNode(1, 'cause'); This behavior occurs when the Xbox 360 console experiences a hardware failure. THINGS TO TRY loadTOCNode(1, 'whattotry'); 1. Turn off the console, disconnect all the cables, and then reconnect all the cables. Turn the console back on. 2. Turn off the console, and then disconnect any accessories that are connected. For example disconnect any Xbox 360 controllers, Xbox 360 Memory Units, and the Xbox 360 Hard Drive. With the accessories disconnected, restart the console to see whether the problem continues to occur. This can help determine whether the console or an accessory is experiencing the problem. 3. If you continue to experience this problem, contact Xbox Customer Service.
Note If the agent cannot help you resolve this issue, you may have to return the console to Microsoft for repair.
Answers & Comments
Powersupply failure, contact your dealer.
Heres what microsoft says about the error
I hope this comes out readable.
Xbox 360: One red light flashes on the Ring of Light and you receive the "E74" error message
SYMPTOMS
loadTOCNode(1, 'symptoms');
When you perform an auto update on the Xbox 360 console, and then restart the Xbox 360 console, the lower-right quadrant of the Ring of Light (RoL) flashes red. Additionally, you receive the following error message:
E74. System Error. Contact Xbox Customer Support.
CAUSE
loadTOCNode(1, 'cause');
This behavior occurs when the Xbox 360 console experiences a hardware failure.
THINGS TO TRY
loadTOCNode(1, 'whattotry');
1.
Turn off the console, disconnect all the cables, and then reconnect all the cables. Turn the console back on.
2.
Turn off the console, and then disconnect any accessories that are connected. For example disconnect any Xbox 360 controllers, Xbox 360 Memory Units, and the Xbox 360 Hard Drive. With the accessories disconnected, restart the console to see whether the problem continues to occur. This can help determine whether the console or an accessory is experiencing the problem.
3.
If you continue to experience this problem, contact Xbox Customer Service.
Note If the agent cannot help you resolve this issue, you may have to return the console to Microsoft for repair.
okey that didn't come out very well, you can read what microsoft says about the problem here