Canon digital cameras have a range of different settings and options. If you've changed the settings over time, changing each one individually back to the factory setting can be a time-consuming process. It will be much easier to just reset the entire camera to the factory settings. Although the menu layout may vary slightly between different Canon models, the process of resetting your Canon camera still follows the same basic principles.
Turn on your Canon camera by switching the power dial on the top of the camera to the "On" position.
Press the "Menu" button on the back of the camera to bring up the menu display on the LCD screen.
Highlight the left side of the menu bar by pressing the left directional arrows located next to the "OK" button on the back of the camera.
Navigate to the pencil icon or the "Setup" tab using the directional buttons. Once you have highlighted this option, press "OK" to make your selection.
Scroll down using the directional arrows to highlight the "Reset" option. Press "OK."
Press "OK" for a second time to confirm your decision to restore your Canon's factory settings.