Unplugging before the thunderstorm is ideal, but it may be the case that you are not near your computer when the storm is coming. Fear not, there are other preventative measures.
Remember that even the best surge protectors will not protect against a direct lightning strike. [2] X Research source For ultimate protection, if you happen to be home, unplug the surge protector in the case of a threatening storm. The use of surge arresters can prevent damage through a shunt device that activates in one nanosecond or less. When the arrester detects a voltage spike, it instantly reroutes the voltage to the ground and saves the devices from being affected.
If you regularly connect your computer to the internet, ensure the surge protector has an internet cable surge protector. Look for a surge protector that offers insurance to cover the loss of properly attached equipment.
A UPS will be particularly beneficial if you have a home office or continually run operations on your electronics. Most UPS devices will also protect your devices from power surges.
If any of your telephones or other electronics show signs of damage, it’s wise to assume that your computer took a hit too.
Use your sense of smell. If your computer smells acrid, there may be invisible damage.