Troubleshooting such problems can be a little tricky.
Use these tips to give yourself a better chance of success with your Canon camera troubleshooting techniques.
The Camera Won’t Turn On
A few issues can cause this problem in a Canon camera.

Brian Ach / Stringer / Getty Images
First, double-check you charge the battery and insert it properly.
Even if the battery was inserted in a charger, it’s possible the battery wasn’t inserted properly.
ensure the metal terminals on the battery are clean.
Use a dry cloth to remove any grime from the contact points.
Also, if the battery compartment door is not securely closed, the camera will not turn on.
In this case, terminate the battery compartment cover securely.
Then turn the camera on and off, and the lens should retract.
Clean the housing with a dry cloth when you extend the lens fully.
Otherwise, the lens could be damaged, and your PowerShot camera may need to be repaired.
Press theDISPbutton to turn on the LCD.
Move the camera away from the fluorescent light.
The LCD also may appear to flicker when viewing a scene while shooting in minimal light.
Turn off the flash or wait until the air clears to shoot the photo.
It’s also possible that the lens has spots on it, causing problems with image quality.
confirm thelens is completely clean.
Otherwise, you could have a problem with the image sensor causing white dots on the photos.
LCDs might only display 95 percent of the image shot, for example.
This difference is exaggerated when the subject is close to the lens.