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Things to check first for a camera that won't turn on are battery contact points, and micro switches that are located on the battery and memory card doors. Troubleshooting tips on other things that need to be checked may be seen here. These tips won't work for every case, but they're worth a try.
I experienced exactly the same problem with my A345. Check for a small L shaped lug on the inside of the battery cover which should operate an interlock switch located in the recess next to the PUSH TO EJECT label. The lug on my camera had snapped off, although this wasn't obvious until I looked at the illustrations on pages 10 and 11 of the owner manual.
My quick fix was to wedge a piece of matchstick into the recess to lock the switch in its operational position. The purpose of the switch seems to be to ensure that the camera is switched off when the cover is open, but as the battery connection relies on the cover being closed, this is liable to be the case anyway. The only possible risk would seem to be if one attempted to remove the memory card with the camera switched on while being run from an external power supply.
Remove batteries and clean the contacts in the bottom of the battery compartment with a pencil eraser and polish the compartment lid contacts.
Gently polish with a tissue the card contacts.
Then see what happens.
If the same fault persists squeeze the battery cover.
If it then stays on, open the cover ,take a small piece of foil to cover the batteries to pack it out a little.