No idea. I never tried anything with the camera apart. I was too nervous that I might break the unit. If you were to call Canon Tech Support and hopefully get a technician on the line then maybe they could point out something that you might have missed.

On mine if I hold the Set button while powering on the camera the screen lights up and shows the time. Did yours ever do that? Maybe a keypress combination might be out there to "Reset" the camera as well. Maybe a firmware flash might fix it...

I am at a total loss as to what else to suggest.

Good Luck
Rene