What does it mean when the power button on your Xbox360 flashes red and wont turn on properly?

Is it all 4 lights on the 'Ring of Light'? If so then it's probably something to do with the AV cable. Have you accidentally selected the HD output switch on the AV lead? I did this and panicked, it's no big deal. Here's the MS help: http://support.microsoft.com/kb/906652/en-us What is a big deal is a single red light flashing. This could be serious, as this article notes: http://www.xbox360fanboy.com/2006/05/29/the-xbox-360-and-glitching-six-months-later/ If you're experiencing this, then I feel sorry for you. Luckily apart from getting the AV cable connection messed up, I've had zero problems with my console. Here's the official MS help for this problem: http://support.microsoft.com/kb/907535/en-us