Are you removed the battery, reinstalled it again? Wont work? Lesn mechanism stuck or internal failed; the G9 is a precision instrument. Alot users with this problem report to
Canon Service (click
HERE), I attached one answer and comment:
On the service sheet it said this:
Examination/Request Details:
LENS ERROR MESSAGE. LENS IS EXTENDED. CHECK ALL FUNCTIONS, REPAIR TO GOOD WORKING ORDER.
Service Details:
We have examined the product according to your request, and, it was
found that the optical assembly was inoperative there was no display on
the LCD. The optical assembly was replaced. Other inspection and
cleaning and parts replacements wer carried out.
And the best news was the cost: $0.00. Everything is back to normal and in good working order. So, if you have
the same problem that I did, I recommend going to the link I had in my
first post and going through the repair process. Overall, it took 10
days to get it fixed and back in my hands.
While it was really annoying that this problem happened, I have to say
that Canon was satisfactory in repairing the problem, getting the camera
back to me in a decent amount of time and NOT charging me. They were
also good at emailing me when they received my camera and when they had
shipped it back to me (complete with 2-day delivery thru FedEx and a
tracking number).
So if this happens to you, I wish you the same luck that I had!
END.
Also could check this generic procedure:
Lens_Error_SupportHope helps.