Reset your circuit breakers.. and see if it problem still exists. Also you can put a meter on the cord and verify that it is good. You need a multi meter to do this. If you don't have one, it a good addition to have on your rig. If you need detail instruction on how to test you power cable let me know.
Get a surge suppressor, this one is the least expensive and will provide you with circuit testing and surge protection every time you hook up to power. There are more expensive ones out there that have more bells and whistles, but this meets the minimum needs.
Using mine I found two campsite with no ground which can be very dangerous.