Those three red lights have struck my system again for the second time. The first took place last November. I was playing some MP Gears of War 2 with my friends when my system shut down.
Xbox customer service is always a pleasurable experience.....(hope you picked up on the sarcasm there). I will be sending my system off this week and the nice little lady on the phone, who is somewhere in a distant country, told me my system would be out for three weeks.
I got to find something to fill my 360 time to keep me from going insane.