If you have "all dc power
" are you talking about 120v shore cord power? Have you checked for power from the outlet or pedestal? (turn breaker off, then on again to reset) Next check the main breaker in your power panel. If that's O.K., then check that the shore cord has a good plug and try it in another outlet. If you have a generator, make sure the transfer switch is connecting when connected to shore power. It should make a loud 'clunk' as the solenoid closes.
It would help if you go to 'User CP' and fill in RV details in your signature so we know what type of RV you have.