i found this out when i was packing for school.
I had unplugged the system's chords out of the TV and then realized that i needed to get one of the games out of the system before i boxed it up so i turned it back on.
It turns out if you turn on the system while the chords aren't in the TV, it by default flashes a 4 light red ring...as if it really needed to tell me "hey. system's not plugged into the tv" when it's all sitting right in front of me
big thing though was - for someone who's system's never red ringed - something like that's the last thing you want to see the day before you're getting ready to leave town