hi there. with regards to your problem, may i know how old is your notebook? and in what places you're using this? for the first possibility of overheating is DUST on your fan. the longer we use our notebook the more dust it will take inside. and for the place where you are using it...if you use this in a room where dust are everywhere then you need to open your notebook to clean only your fan. then try to boot again. second possibility is that your fan needs to be change when it rotates very slowly. hope this will help. cheers.
hi just wanted to give some note with regards to your problem...you only need to clean the fan and the parts around it where it is connected. Else if your fan rotates very slowly than the normal one-its better for you to find a replacement fan.