Answer to: My xbox is lit with a single red dotBefore you go getting all complicated try this. Take your vacuum hose and brush and attack all of the vents. When you get to the one that the fan sits under take off the brush and position the hose over it till the fan spins. Let the fan spin for a moment. After awhile when the CPU cools try starting it up. This has worked several times for me. The better solution is to clean it before this happens.