Respuesta a "Must Remove the battery & then reinstall it to get camera to turn on."A word on the CHDK software. Even though it loads via a firmware update, there are NO actual changes to the firmware. It is strictly SOFTWARE and resides on the SD card. It's a little tricky to get it loaded and operating the first time until you become experienced in the quirky procedure (locking the card, making the card bootable, etc.). I have CHDK loaded on all my Canon PS cameras, never a problem (unless you copy the wrong version for your camera, then it just doesn't come on until you remove the software from the SD card). It's really good SW, and also have a battery voltage indicator option which might help with troubleshooting. One more thing- you can prevent the software from loading by simply unlocking the SD card and turning the camera back on. Good luck!