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Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ... Here are some troubleshooting steps that you can try that may (or may not) correct it. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty (or repair cost approaches that of the camera), they're worth that try. Some of the later steps do involve some risk to the camera, so carefully weigh your options before deciding to conduct them.
i had the same problem, if you try to turn the lens in as if you turning a dile, the lens will go back in manually once you have the lens completly in again, as if the camera is switched off, then turn the camera back on at the power button and the camera will operate as normal, this worked for me i hope it works for you too.
Had the same problem a few months ago.There was a high pitchedwhisltle and I think the screen said "lens fault.turn off camera" or something similar.Bought a G9 to replace as the 7 was out of guarantee but sent the 9 back to the e-bay reseller as it was obviously secondhand with grit around the lens ring and the viewfinder.Ebay never again!.So 3 months ago ago I tried the G7 again with a fresh charged battery before I consigned the camera to the loft.I noticed that each time i switched on the whistle and message was there but the lens extended slightly further each timeso I kept rebooting until the lens was fully extended.Turned the camera off and on again and everything was back to normal.It seems that this may be Canons protocol when a camera goes back.Its been absolutely fine until today.It wont boot up at all.I have tried 2 fresh charged batteries and its dead.Any ideas anyone?
The unusual beeps usually occur when the lens cannot be extended or retracted, often due to dirt in the gearing or the lens cap being left on.
Try using canned air to blow around the outside of the extension cylinder, and, putting a fresh set of batteries in the camera (it probably got stuck on since it couldn't fully retract the lens and didn't complete the shutdown).
If that doesn't work, try taking it to a camera store with repair technicians and having them take apart and clean the lens extension/retraction mechanism.