damn this is another example of why manufacturers should not design anything with a glass screen/bezel unless it is absolutely necessary for touch input etc.

ironically it is actually a good thing that there are no LEDs or response from the notebook as it could simply be a faulty power supply.

do you have access to another known to be working charger or power supply? If yes please do try it on your f15, if it does nothing as well then your notebook is probably beyond repair.

Also, first thing to do is to make sure that the notebook is not updating windows. The celeron processors are not very powerful, even with just windows update running in the background it would suck up all the resources.

do you have any pictures? it’s probably just the thermal paste hardening, you can try wriggling it a little and if it moves it should be safe to twist it and ‘force’ it off.