Any repairs done by anyone other than a Certified Microsoft Repair Center are considered System Tampering or Hardware Modification and can result in a permanent console ban.
Please see this link to the support.xbox.com website for this code:
support.xbox.com/.../system-update-help.aspx
xxxx-xxxx-xxxx-xxxx-C000-0099
This error occurs if your console has been tampered with or modified. Your console can no longer connect to Xbox LIVE, install software updates, or play new games that require a console software update.
This link will direct you to the Xbox Live Terms of Use:
www.xbox.com/.../LiveTOU
This particular portion of the ToU will be of significance to you and the issue you are experiencing:
12. Service Operation and Equipment.
The Service may only be accessed with an Authorized Device or by logging into your account via Xbox.com. You agree that you are using only authorized software and hardware to access the Service, that your software and hardware have not been modified in
any unauthorized way (e.g., through unauthorized repairs, unauthorized upgrades, or unauthorized downloads), and that we have the right to send data, applications or other content to any software or hardware that you are using to access the Service for the
express purpose of detecting an unauthorized modification. Any attempt to disassemble, decompile, create derivative works of, reverse engineer, modify, further sublicense, distribute, or use for other purposes the Service, any game, application, or other
content available or accessible through the Service, or any hardware or software associated with the Service or with an original Xbox or Xbox 360 console is strictly prohibited and may result in cancellation of your account and/or your ability to access the
Service, and the pursuit of other legal remedies by Microsoft. Microsoft may take any legal action it deems appropriate against users who violate Microsoft's systems or network security, this contract or any additional terms incorporated or referenced in
this contract, and such users may also incur criminal or civil liability.
Microsoft reserves complete and sole discretion with respect to the operation of the Service. Microsoft may, among other things: (a) restrict or limit access to the Service; (b) retrieve information from the Authorized Device and any connected peripheral
device used to log onto the Service as necessary to operate and protect the security of the Service, and to enforce this contract; and (c) upgrade, modify, withdraw, suspend, or discontinue any functionality or feature of the Service, any game or other content
available or accessible through the Service, or any hardware or software associated with the Service or with an Authorized Device, from time to time without notice, expressly including by the automatic download of related software directly to your Authorized
Device, including software that prevents you from accessing the Service, playing pirated games, or using unauthorized hardware peripheral devices.
Repairing the console is not an option if a console ban has taken place. The only option is to purchase a new console.
