Wikipedia has an article of the Red ring of death.
The red ring of death is like a hardware failure, when some files that mean ALOT to the system/program gets deleted/replaced/ edited. Basically, the screen goes red, blue, yellow or green(Depending on the program/system).In this case, XBOX 360s have 2 rings- the ring of light when it starts up and when you plug in a contorller, and the ring of death, a red ring that can make you buy another system or download the program again.
I hope I don't have that problem.