If you are using rechargable batteries, certain camera's don't like them if they are double A's (AA's). The voltage for most rechargable batteries are 1.2v whereas most regular AA's are 1.5v. Doesn't seem like a big difference but if you have to use two of them, the voltage drop is over half a volt, and you will see problems like you state.
Hope this helps.
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Re: Digital camera on/off
I have this problem myself, what i did was blow out my camera's dust and double check on the new batteries. I had to turn off and on to get to loosen up but it did. I guess dust got in camera gears and made it hard to turn inside.
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Perhaps you still remember the add from IBM. Where the son says, or we put in the power plug!!! There are more errors with portable equipment caused by empty batteries than all other causes together.
Please remove the battery and charge the battery, before placing it back. And even when the charger indicates the battery is full, it is no 100 % guaranty it is. Even almost new batteries, can lose capacity within minutes. Those are defect and most of the time not to recover.
Be aware, to change firmware, if it should be available, you need a working camera. And a fully charged battery, because if during the update the battery runs out of power, your camera won't work again, without an intervention of the repair shop.
Make it a habit to charge the batterie at least every 3 months, even if you don't use the camera for a longer period.
did old batteries leak acid?if so it will short contacts that connect batteries try cleaning with rubbing alcohol and qtips and stretch springs a little bit with tweezers!!!!make sure good and dry before installing new batteries also test batteries should bo over 1.5 volts ive had bad new batteries!!!
Powershot A640 Could Not Be Powered On, Burnt Smell
My Powershot A640 died during a picture shot, lens remaining open. I thought it may be due to the dead batteries. But after putting new batteries and pushing the on/off button, the on/off indicator blinked once then shut off by itself. After a while, a strange smell came from camera batteries area, and I could feel warm there too. Immediately I took out all the batteries from camera.
When checking the posts here the other day, I tried one solution and got the lens back to close: first took out the memory card from camera, then put the new batteries in; push the on/off button with no memory card. I found the lens retracted a little before camera shut off by itself. I pushed on/off button three times to get the lens fully close. However, the burnt smell came out again. I immediately took out the batteries.
Did I get a short circuit inside? Is there any ways to fix it?