There could be a few underlying issues. The most common issues are: (1) The flash capacitor may be dead and will need to be replaced (2) The flash unit/bulb may be faulty and may also need to be replaced. Use this link to find the replacement guides Sony Cyber-Shot DSC-W830 Troubleshooting.

The capture button seems to be faulty. You need to follow the replacement guide to replace the Capture/Flash Control board. Refer to Sony Cyber-Shot DSC-W830 Troubleshooting to replace the unit.

Is the engine actually overheating? If not, try replacing the temperature sensor. If the engine is overheating, try checking the coolant level. If it is low you have a leak somewhere. Add coolant if needed and service the cooling system.