I need help!!?

Okay My computer is in serious errorness(?) It won't turn on even so it works sometimes when I debug it but lately it hasn't done that. It all started the other day, we were supposed to have a tornado so I turned it off and than unplugged it, ever since than it's been crap. So I need all you computer geniuses' out there to help me out.. Please? It'll be awhile before I get your answers because i'm using library/sisters computer.