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Check to be sure the drive belt is still on there, but typically these have issues with the powersteering pumps. You would need to take a fluid pressure test to further verify this, however, you can use a turkey baster to remove most of the fluid out of the pump. When the fluid is low the pump should make a girgling sound, indicating it is trying to pump fluid. If no sound is heard, the pump is not pumping. Also, if the fluid is low, add some and see if the power steering comes back in, if so, then the problem is due to a leak, possibly behind the pump or the high pressure hose.
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