My computer will start booting normally, then at random points in the startup, it will be like a switch was flipped: the boot will suddenly stop making progress. whatever was on the screen will not change, and the fans will start going crazy blowing at max speed while the temperature of the machine increases gradually (I can feel the temperature slowly increase from outside). To clarity, i'm pretty sure the temp isn't the problem. It only starts heating up after the startup stop progressing. Help please!! Thanks in advance!