Red Rings of Death

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I was playing the Gears of War on the 360 earlier, the xbox crashed,
and the red rings of death were there....

Never a good sign, I looked up some stuff on the net after turning it off,
I didnt know the rings actually meant different things.

However, it was after I had turned it off I found that they did different things,
so I dont know what the problem was with it. Hopefully it just overheated(relatively minor).
Even so, this doesnt bode well for my relatively new(and this is what is annoying me) Xbox 360.
I heard the returns service that Microsoft provide is pretty good with dealing with this stuff. Lets hope I dont have to use it any time soon....

I'm worried now =(