I have an simpson encore 605 6.kg and there is no lights?

My Simpson encore 605 6.kg had stop working when i put my load on an pop out for an hour or so an came back an found that it had stop working an every thing was still turned on but no lights were flashing an i checked my cord an switch but those are still fine.Hasn't turn on since.. Paid for an electrician to look at it an told me it was my plate that was stuff..Could this be true?I was thinking wouldn't it be the fuse?Please help?