Question about Canon EOS 40D Digital Camera

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Canon 40D can not turn on

My 40D cannot start up. There is no response when I push the On/Off button. It remains the same after changing to the full-charged battery which came with the camera.
Thanks for your help.

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Same problem. Fully charged main battery. In my case, I hadn't used the camera in over 6 months. All I did was pull the main battery and then pulled the small CR 2016 button cell battery located inside the main battery compartment and re-inserted both batteries. The camera made a quiet click and then turned on with the main power switch and asked to reset the date and time. Works fine now. If this doesn't work just purchase a new button cell.

Posted on Sep 13, 2011

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My 40D cannot start up. There is no response when I push the On/Off button. It remains the same after changing to the full-charged battery which came with the camera.
Thanks for your help.

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