Peugeot 307 power steering pump problem

Hello! Dear forum members, I had an unfortunate accident recently, and unfortunately the car's ten bumper headlights and power steering pump treasure have been smashed. Anyway, we took care of the bumper and headlight. We bought a new oil treasure for the steering pump, but it doesn't work. What could be the problem? In other words, we tried to make computer error detection and the computer does not see it. Help me, please.

First of all, did you look at the installation of the steering pump? Is there electricity to the pump

So I did not look. Can I take care of myself?