Went to turn on the camera this morning, and got.... nothing. No lens extension, no display on the screen, not even a grinding noise to tell me there was a definite problem.
Replace the battery, try it without the memory card, manually trip the battery door sensor, verify battery contacts are touching posts. All to no avail. So, I currently have a shiny black brick that looks an awful lot like a camera, but serves only as a paper weight.
Time to email Canon and get another repair ticket setup. Hopefully this one will be covered under warranty at least.