Firstly, do you use a 'Power Surge Protector'? If the answer is YES, then it is unlikely that your problem is anything to do with the thunder storm. If on the other hand your answer is NO then as Fruit Bat /\0/\ said it's possibly your PSU (Power Supply Unit) or Mobo (Motherboard)
No signs of life at all and no power surge protector. This happened a long time ago but as far as I remember there were no problems before. The computer has just been sitting around doing nothing for the last couple of years. How much would a power supply unit, motherboard or cpu cost? Because the computer is old I need to weigh up if it is worth fixing.
skippers, what is the spec of the PC? Do you remember?
If you don't know, can you open the case & tell us the make & model of the motherboard at least? With this info we can tell you what motherboard, CPU & PSU would be suitable. Even if the parts are outdated & no longer available in the shops, there's always eBay (that's if you don't mind buying from there).
Graphicool1, a surge protector really offers little to no resistance to damage from lightning in a thunderstorm. An uninterruptible power supply (UPS) yes, to some extent. G