To answer your question its simple your pc got a huge surge what do you think happens to electronics when they get hit with like 1000 volts they fry. Just because you can't see it doesn't mean it isn't damaged your pc is toast it will always have these problems forever. You need a new pc or if you're really extremely lucky it only damaged your PSU! Try replacing that first if not there is more damage than expected. I am very sorry but not just in personal but a very highly professional military expereince and years of module and component level troubleshooting I have seen a lot of this.
I'm telling you right now that it's gone. It could be a fried component, like a resister, capacitor, inductor, tranformer or something. It takes a boat load of experience that even I have barely gained to desolder and resolder a new component. On top of that its not guaranteed to work since its totally possible more than one component could be bad internally and not even show a burn externally or some type of damage. Honestly just get a new pc sorry kid next time its best to invest in a good power surge protector and spend a min of $60 the kind that actually tell you if you're grounded or not. Also they can take multiple surges the cheap ones don't show if you're grounded and often are only good to take one hit!
Then they're only good as an extension cord but will no longer protect your stuff! Again I am very sorry to be the bearer of bad news but its the truth new pc and a reliable surge protector will save you a great deal of headaches and money. ALL my expensive electronics are plugged to such a surge protector they have servede well for over 2 years and taken a hit from numerous power surges. Electronixs do weird things when hit by an OD of volts this sounds common to me funky workings after a hit is a good sign of damage. Might not be the answer you want but its reality bro sorry.
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