If it doesnt come on it might have red light of death
what happend was you xbox overheated and it melted the CPU chip on your board, well didnt melt the chip but the solder around it there for it made soldering bridge connecting by melting 2 different component slots of solder into 1 so you will have to take it apart and resolder it. Or you can send it to Microsoft and they can fix it for ya for some $$$ out of your pocket but mostly they just give you new one and you loose all you data and saves so i did mine my self.
You tube has guy named gilski he shows how to fix ps3 and xbox red and yellow lights of death
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It means theres an error when it happens just reset (turn xbox 360 of and on again) or if it still does it there mite be something wrong with wires etc.... =)
A single red light or "Red Ring of Death" means that your console is not securely plugged into it's power supply (The gray rectangle box) or an electric outlet. If you have an E74 Error Code then your Xbox 360 console needs service, if your console still has a warranty on it you can get it repaired for free on xbox.com
Your cords in the back are not connected well or your XBox is dieing.
it means somthing is not plugged in well
how I fixed my xbox 360 from the red ring of death was by not playing it or turning it on for 1 to 2 days DO NOT DO THAT!!!! If you have the pro xbox (Which is just about every single 1) just unplug it and plug it back in. !PEACE!