I was about to buy deoxit until I saw your message.My canon camera is still in the closet and hasn't worked for a year now.S100 really does have a glitch batch and its not an insignificant number looking at the number of users on this thread.
Let us know how it goes. I still couldn't resolve mine even after trying to huff into the camera as suggested by some members above. It worked for a few seconds then it just became as dead as ever....
I haven't, no...But have you tried blowing into the right side of your camera where the flap covers the USB ports?This solution is SocalJD's solution