Back in October 03 at 21,402 mi. I noticed that I was having problems with vibrations in my power steering in my 2001 Prius on start up. I took it into my Toyota Dealership and explained the problem. They replied that they were unaware of the problem and could not duplicate it. A few months later I told them about the ongoing problem during an oil change and they said that they still could not find a problem. About 2 weeks ago at about 28,000 mi. I got into my car one morning and put the car in reverse. The steering wheel swung left uncontrollably and twisted my wrist. I called the Dealership and spoke to my service writer. He told me he was still unaware of a problem existing but I should bring in the vehicle when the problem happens again. I started video taping the steering wheel every morning on startup and reverse and finally was able to catch the steering wheel vibrating but not violently twisting left. A couple of days ago I received a warranty extension from Toyota regarding this problem. I called my service writer and told him what I received from Toyota and what a coincidence this was since I had called him about the problem earlier the week before and he said this was the first he had heard of the extension. He told me to bring in the car and his people would call Toyota and confer on this problem. I was wondering if anybody out there has experienced violent steering wheel motion.