The motherboard wasn\'t weaker, it was partially screwed.
Some components would have been cooked. So certain things would have worked fine while other things close to the killed components or on the same tracks would have most likely had problems. The storm would have spiked the motherboard.
Even if u have a surge protector, electricity can jump tracks and still fry your pc. I\'ve got one on my Fuse box, PSU and Power board; I still turn my pc off during a lightning storm.
Surge protectors are really good for 1 thing, insurance claims.