Hi,
Please do try these troubleshooting steps that may help.
- Start with a hard reboot, unplug it's AC adapter then press and hold the power button for 20 seconds then try booting it.
- If it doesn't work reseat the RAM, remove them all for couple of second then put them back in making sure everything is seated properly.
- Again if these doesn't work but you can hear the laptop on but with no display, connect an external monitor and see if it would display anything because if it does that means it's the built in display that is faulty.
- Next to try is if your AC adapter is still okay by trying another AC adapter that has the same voltage and see if it would work.
- If all these will not work it would be a motherboard problem.
If it does turn on after doing all these troubleshooting steps you'll need to open your laptop to clean the inside of it and apply new thermal paste on the CPU and GPU that should help it from not overheating again but if these will not work you may need to get a cooling pad to help it further in cooling it down.