I have Sony Cyber Shot W 830, bought 2 years back. I did not drop, nothing I did but when I turned it on, the lens extended and stopped. No button worked, couldn’t even turn it off. As a last resort, I pushed the zoom lens hard in, and took out SD Card. I turned it on and it worked fine.

It seems the SD Card was causing the problem. Maybe, the SD Card slot needs cleaning. Yet to find out. Right now, internal memory saves pics, not many though.