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After a fall like this (even on carpet) it probably has a cracked circuit board or a loose connector, first (since you took it apart any way) look for all connectors, than unplug them and re-plug them to make sure all plugs and boards are seated correctly, if you still don't have luck, than take out all the circuit boards and check them for cracks under a good lamp and magnifying lens, than repair the cracked traces with a good soldering gun by scratching off the varnish coating and applying solder. (if the crack is to wide you can solder a peace of coper wire to the trace on the board)
Canon G9 has a problem where two screws in the top of the camera work
themselves loose over time, then fall out and short out the fuse on
what's called the DC/DC board.
This board needs to be replaced,
both screws need to be found within the camera (if both fell out), and
they need to be put back in place and held in with 'Locktite' so they
don't fall out again.
If you do a Google search for "g9 no power
repair" you will see in the #3 position Darntoothysam com, where you can
have this repair performed for $85 total! This includes the part,
installation, and return shipping of the camera.
If you want to
do the repair yourself (no instructions included, sorry) you may
purchase the part you need for $48 including shipping.
I was having a similar problem. After finding the service manual (4402_X73.pdf) and taking the thing apart, an ink-covered broken spring fell from the inside. I checked around the 'Maintenance Station' and found the other half still hanging. Apparently -because I haven't got a replacement yet to confirm- the spring goes across the bottom of the 'Maintenance Station' to a lever on the other side. If someone can tell me where to post a picture of the thing, I'll gladly do it.