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I'd check the power steering pump reservoir first. If it's low, then think about the last time you checked it. If it was recently, then look for a leak.
For a story - my oldest daughter's first car once had a leak in the high pressure line from the power steering pump. When the engine was running, the pump sprayed power steering fluid all over the engine - and that produced a lot of white smoke! But you couldn't see the leak with the engine off. And I couldn't figure out where the smoke was coming from, because I could never get a clear view of the leak due to the smoke. After two nights of looking and thinking, I finally brought it somewhere to get repaired. But I know what I'm looking for the next time it happens!