mini cooper s jammed steering after hit on the back

All things are possible. The power steering pump is eletronically controlled. The power and ground conections should be checked. These steering system has had failures without being in an accident. I see a TSB that indicates the manufacturer has extended the warranty period on pump and fan motor. The dealer can check to see if your car is covered. Electro-Hydraulic Power-Assist Steering Pump (EHPS) and Cooling Fan: Warranty Extension to 13 years/150,000 miles

call your insurance co and get adv