Yep have to agree with Johnboy3 - I find a lot of burned (cold solder joints) go bad on the back of the power relay board. Just clean up that contact point with a wire brush and pull out the trusty soldering iron. You should get her back up and running in no time. Most people just order a new board but just open that board up and take out of the case, flipper over and you should see a Solder Burn mark on the plastic casing. Throw some solder on that burn't solder joint and you should be good.
Let us know how you make out!