Somebody help. Why is my notebook so hot? In addition, after 2 3 hours of use, the fan sound is obviously loud.

It has nothing to do with machine life. It should be that there is too much dust inside the machine and the heat dissipation is not good. The back cover must be opened to completely clean the dust on the heat pipe and fan. Blue screen died for too many reasons. If you haven't changed the hardware, the best case is the software problem. The easiest way is to reinstall the system. The trouble is that there is something wrong with the hardware, and in most cases there is something wrong with the memory stick.