What make is it? Most pumps seize up if there is no water in them, if it's that sort of pump you can scoop water over it to get it going. (Which is why I ask, because rarely it'll be a dry pump and that would be very bad to pour water over.)

You should be able to find out online? Or let me know what kind it is and I'll try to help?

(Unless it's sorted itself out, which happens too.)