This is what i learnt from a video (it works to). Basically your xbox overheats by playing a graphical game like COD4 or something which causes the GPU to vibrate and come loose. The GPU coming lose basically causes the ring of death. To fix it you basically got to get to the GPU unit by unscrewing the xbox. When you get to the GPU unit you basically put it back to place and use washers between the motherboard and the heat sink.
I might not make sense, if i didnt then go to this link to watch video footage of the causes and repairing:http://uk.youtube.com/watch?v=IxMIHlPXF8I





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