In that case i'm guessing the entire motherboard is fried not just the power supply. You didn't have it on a surge protector in the first place?I figured it's gotta be the power supply because it worked before a lightning storm and didn't work after so I'm thinking maybe there was a power surge that fried it as its the only item I have that's not plugged into a surge protector. I've since purchased a whole home surge protector. Idk just a blind guess.
I hope you have the option to return the powersupply if it doesn't work. Good luck!