Car won't start it will turn over and want to start but wont.

What is your question?

I went to work came back parked it in front of the house and a couple hrs later went to go to the store and it wouldn't turn over had no power to start tried jumping it(had the cables wrong first think that why the alt fuse blown out ) and wouldn't start checked fuses all were good but alt fuse replaced it got power to the car would turn over but wouldnt start, had battery checked and charged and alternator checked and all came out good I don't know what to do called a couple places and they said it would be $90 just to find the problem not even fix it or anything, need help plz