Can i reset my iphone 5 if i don't have my password or the original computer?

I just bought my at&t iPhone 5 a few months ago and I can't remember the password I recently put on it so i'm locked out of it and I can't even connect it to the original computer it was synched to because it broke down. Now I'm locked out my iPhone and want to reset it completely and restart all over by connecting it to a new computer how exactly can this be done?

Call Verizon or apple