outlets lost power
When you say all power was lost, do you mean that you've tested them and there is no voltage between hot and ground? Or do you mean you've plugged something in and it doesn't turn on?
If you haven't tested it yet, test from hot to neutral, and hot to ground.
If the receptacles don't work, but you have 120V from hot to ground, then you probably have an open neutral. It should be in the last working outlet, or the first not-working outlet (assuming you have an idea of what order the circuit is wired.