My camera turns on the lens opens then it turns right back off.... the battery is fully charged so thats not the problem...

Try the procedure in this tip.

Hi there,There are a few things we can try/check here!
1.Turn the camera OFF. Remove the battery and clean the contacts (shiney metal strips) on the battery.2. Remove the lens and clean the lens contacts.3. If you have a body cap, put it on the camera (no lens, just to keep dust out right now).4. Reinstall the fully charged battery and turn on the camera.
It should start up. If so, turn it back off and reinstall the lens.
Also, be sure to check all the doors/hinges on the body. These are found on the battery and the memory card. They have electrical contacts on them that need be to be fully closed.
If possible, try a different battery (a friends, or take it to your friendly neighbourhood camera shop).
Hope it turns back on!

Hello ..Yes please make sure your batteries are fully charged..If battery is charged and still shuts down..There is a good chance lens was hit or bumped.When lenses are bumped the camera will try to extend lens upon power up as part of cycle.If camera detect problem with lens not opening..Then it will shut down...

Have you made sure that the batteries are LiIon and fully charged? I had a similar problem with a Kodak Easyshare camera that required the higher voltage LiIon battery pack rather than alkaline AAs which will fit in there but is not exactly right.

1. If any accessory devices (memory card, lens, USB cable, camera or printer dock, etc.) are connected to your camera, disconnect them.
2. If your camera is on, turn it off.IMPORTANT: Verify that the battery/batteries are installed correctly.
   
3. Install a new or fully charged battery/batteries into your camera.
4. Turn on your camera.
5. Set the flash to .
6. Take a picture.

the batteries needed for the cameras are quite high powered

though the batteries show that they are fuly charged most times they have lost their actual capacity of power storage in them so not being able to supply enough to start the camera best way to test this is to start the camera on preview mode if this works then you will need to buy a new set of rechargable batteries, i would suggest to take batteries in the range of 2000MAh to 2500MAh and

the normal batteries will not be able to sustain long even for normal lens open and retract functions, instead of normal batteries try LR6 varieties (eg: Duracell, Energizer, etc)

Please check whether you're using a fully charged battery.
After fully charging the battery if the issue still persists, please try Power Resetting the Camera.
To Power Reset the Camera.
First, please turn OFF the Camera.
Then, remove the battery pack from the Camera.
Then, press and hold the POWER button on the Camera for 30 seconds.
Then, reinsert the battery pack and check whether the issue is resolved.

Hi
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?

If your battery is fully charged, then it would need to go to repair

A lens error is something that can only be fixed my sending in to the repairs department. There is nothing that can be done at home to fix that.