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That's a loose screw issue inside the G7 and the G9 that is common. The best place I know to get help for that one would be camerasandparts.com They just specialize in the powershots and they are awesome if you need help with one of these. Best of luck, they have your exact G7 no power problem right there on their site. I hope that helps.
Try this: with the battery installed and battery door open, take a pencil, fine tip screwdriver, or anything long and skinny and push the tip of it into the little nub circled in the picture here. There's a spring inside that little nub... keep the spring depressed and try to turn on the camera. If it works, then either a small piece of plastic broke off the battery door or the nub got broken/pushed in too far for the battery door to trigger it. Try using a dab of hot glue to keep the nub pushed into the down position.
Most likely your flash bulb burned out or was damaged. If you feel comfortable opening your camera you can buy a flash module on the internet or ebay for around $20-$25 and install it yourself. If you do so, be VERY careful NOT TO TOUCH the capacitor as those things can store a massive amount of voltage even when the battery is removed and the camera has been off for some time.
If you don't feel comfortable opening your camera and trying to replace it yourself, my suggestion would be to get a new camera. Repairs by Canon usually run more than $100 and the SD300 is a bit old to be laying out that kind of dough, in my opinion.
Connecting a camera to computer via a USB to download is one thing-
Connecting a camera to Computer to feed back the the card is another.
The chances are the firmware on the camera will not accept anything that is not in EXIF format.
Try it -simply connect camera in the normal way.
This will if you have the normal A C D drives will come up us removable storage -'E' with the appropriate icon in 'My computer'
Now pick a file[s] and using the normal
Edit/ Select/ Copy[Or right click] routine then go to the removable media['E?' right click paste
See what you get- you wont break anything