My husband was playing a demanding new game on his laptop when it suddenly shut down. The machine was extremely hot, so we left it unplugged for about three hours to cool completely. It still won't power on, even after holding the power button for 30 seconds and checking the battery. Could overheating have caused permanent damage, or are there any other steps we should try before replacing the laptop?
3 Answers
If the battery can be disconnected, try powering it on with the battery removed and the charger connected. That can help determine whether the battery or charging circuit is preventing startup. Since it was running hot, check that the vents and fans aren’t blocked, and avoid using it on a flat surface that restricts airflow.
Try a complete power reset. Unplug the charger, remove the battery if it’s removable, then hold the power button for 60 seconds. Reconnect only the charger and try starting it again. If the battery is internal, just leave the charger disconnected during the reset.
If it still shows no lights, fan movement, or other signs of power after the reset and charger-only test, the problem may be hardware-related, such as the power circuitry or motherboard. At that point, a repair shop can test it more safely than repeatedly trying to start it.

It may also be worth leaving it unplugged overnight before trying again, especially if it was exceptionally hot.