First a name of machine helps. Also is it gas or electric, anyhow you h a short somewhere. Help us help yo by giving all proper information. :)

First thing I would do is check for continuity between each of the power cord terminals and ground. If there is, you have a dead short and the connections at the wiring block need to be checked. Then I would check for the same thing between the two hot terminals. (If it's a four conductor cord, check for continuity between each hot terminal and Neutral). That's a logical place to start checking, and the easiest to check.