Join Date:Joined: May 2010
Does it work outdoors? When the focus control turns green, autofocus has locked. Maybe it's a low light issue, based on your video? (Also, do you have HDR mode turned on? If so, try turning it off.)
If it still doesn't work in good light, then, if it isn't solved with a factory reset, I'd suggest a warranty replacement.
This is just standard troubleshooting...