The question is what and why have switched it off.
It is a long shot but if the car has not been used for a while battery might be getting flat and power control switched some systems including suspension controller off to conserve energy. You can try running engine for a while to let the battery charge up or charge it off the car and then tell the car you have put new one in.
Might also check fuses and wiring connections.
Other then that I am out of ideas.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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