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While there may be a number of causes of no power, the usual one is that the bottom right screw that holds on the back circuit board has come out and has shorted out a section of the circuit. Usually it blows the 'P' fuse on the front board, but depending upon were the screw ends up it could blow the flash and drive boards or damage a section of the rear main board.
Also check to make sure you do not have bent CF pins - if the center power pins are bent and touch other pins they might blow the circuit. Usually this blows the 'K' fuse under the lower right shield plate on the rear circuit.
Joe, this happened to me, just tonight... I got a new CF card and stuck it in, turned it on and one CF card flash. Completely dead from there. I found one of the CF card pins bent over, shorted out the socket and blew the mainboard fuse. I took the camera apart, found the fuse (labelled K) about under the set button area) I bridged the fuse with a bit of solder, straightened out the pin in the socket, put it all back together and it's working fine. The fuse is under the right side shield cover, it's labelled with a letter K. There is another fuse on the power inlet board (below the shutter button) and it's labelled 'P'...
Make sure you turned the camera on. Could be a bad cable. Best thing to get is a usb card reader. Some people report problems of bent pins because of removing and reinserting them in the camera. So be careful there. Re-Install the software that came with it from Canon. Or you can download it from CanonUSA. URL below.
choose your OS and download what you need.
Looks like ZoomBrowser is up to 6.1 now.
I had the same problem; I could insert the card but it wouldn't read. I Got a CF error message. I was going to get it fixed then I realised that the bent pin was touching the adjacent pin. So I intentionally broke-off the damaged pin... an now it works perfectly! Many of the pins on CF cards don't appear to function.
Obviously, only do this if the pins are touching and you can't bent the pin back straight. You could make thing worse by rummaging aroung the CF slot, but as I was going to send it away anyway, at some considerable cost, I had nothing to lose.