My laptops fan recently stop working, it makes a really loud grinding noise. My laptop would display a message before bios warning that the fan was broken and further use could result in damage but to hit enter to go to start the laptop. After a few hours of use the laptop won’t go past that message after hitting enter and is stuck on a black screen.
If you are stuck on a black screen (screen not coming on at all) it may be too late. Over heating can cause solder to melt among other things. If the laptop will power on but your screen is black your gpu if you have one may have shifted due to the solder melting. If this is the case you may be able to re-float the gpu.