Thank you for writing Xbox Customer Support!
I do apologize for the inconvenience. I understand that you see three
lights on the Ring of Light flash red on the front of the Xbox 360
console. The upper-right quadrant light is the only light that does not
flash red.
This behavior occurs when the Xbox 360 console experiences a hardware
failure.
Please try the following steps to resolve the concern that you?re
having:
1. Restart your console.
2. If that does not resolve the issue, unplug all the cables from the
console, and then firmly plug the cables in.
3. Have the customer power-off the console, remove the hard disk
drive, and then turn on the console.
a. If the 3x Red LED error light is no longer displayed, have the
customer turn-off the console, re-attach the hard disk drive, and then
turn on the console.
If you continue to experience this behavior, contact Xbox Customer
Support.