My digital Sony camera fell down Lens got stuck

My digital Sony DSC-P10 fell down while taking pictures and lens has got stuck in half way.. Lens doesn't go in when I switch off and when i switch on then it can open well and gives error on the screen. ..... can any body help on this
My camera knocked against a the chair back and still worked ok. The next day I was taking photos using multi shop and zooming into the stadium floor just fine - when all of a sudden a message "stating turn power on and off again" displayed & the zoom lens would not retrack to original position. It's stuck at a half way point. I can feel it trying to retract and only gives a slight clicking sound and motion. please help! -kewlndn