This has been requested by a few forum members so here it is! Please feel free to discuss anything having to do with a broken 360 in this sticky. Please do not post any other topics outside of this thread, as they will be locked. Thank you :)
Below you will find a few links to useful topics on the subject. If you know of any other resource that should be listed please PM me or list it here and I will add it.
Official XBOX 360 Site
Troubleshooting your XBOX 360
Official XBOX 360 Forums
Official XBOX 360 Technical Support Forums
XBOX 360 Warranty Information
How To Obtain Warranty Service (90 days coverage from date of purchase)
OBTAINING WARRANTY SERVICE:
To receive instructions for obtaining repair or replacement warranty services you must call: Within the U.S., U.S. Territories and Canada: 1-800-4MY-XBOX (1-800-469-9269); TTY users: 1-866-740-XBOX (1-866-740-9269).
You must also:
1. Submit proof of purchase in the form of a bona fide, dated bill of sale, receipt, or invoice (or a copy) evidencing that your request for service is made within the Warranty Period.
2. Follow Microsoft's shipping and other instructions if it determines that all or part of your Xbox Product requires return for repair or replacement. To obtain the warranty service, you must take or deliver the Xbox Product in suitable packaging that provides an adequate degree of protection against damage during transit, to the location specified by Microsoft. Except as otherwise required by legislation in your jurisdiction, costs associated with transport (including packaging) for warranty service shall be at your expense.
3. Delete or remove any files or data you consider private or confidential prior to sending the Xbox Product to Microsoft.
Failure to follow the above instructions may result in delays, cause you to incur additional charges, or may void your warranty.
Additional Assistance Via Phone, e-mail or live chat
Walk through of an XBOX 360 Repair