And what you have to do if you blow the fuse of the power steering?

No fuses in Power Steering, power comes from a hydraulic pump. if your power steering isn't working folow the column through the firewall and to the sttering box, hoses from the sttering box will attach to a pump and reservior tank and probaly be driven by a belt on the engine. make sure the oil level in the reservior is full, next the hose could have failed, and lastly, and most expensive, the pump has failed.