Ok guys this morning i went to start my car it turned over and then just lost complete power? nothing worked.But when i got home from school my alarm is back on and the car starts ? what could have caused this.

 

check your battery connections and make sure nothing is loose or corroded.

 

This. Corrosion is killer. If you do see any clean it off immediately.

 

Yep most likely some corrosion on your connectors. Clean it off well and make sure the connections are nice and tight.

I had a similar thing happen to me once, but I was driving. Now I always check my connections twice before shutting the hood.