Change Case, iPhone5s not turn on,

I change rearcase on my iphone 5s, very carefully by the instruks on ifixit..

When i finished, everythings is dead..

Tried to connect charching cable, for every 5 sekunds, vibrator turn on 1sekunds. There is different about the new and old rear case. The old one has som ground places, and the new is there no ground places..

Tried to change back to the old one, but nothing help..

Is there someone good advice..?

Best Regards Ibber, from Denmark