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There could be several reasons why the CSS background image is not being displayed:

1. The file path to the image is incorrect.
2. The image file is not in the correct format (e.g. it's not a .jpg, .png or .gif file).
3. The image file is missing, corrupted or has been deleted.
4. The CSS code for the background image is incorrect or has errors in it.
5. The background image is being overridden by other CSS styles.
6. The browser cache needs to be cleared.
7. The browser does not support background images.
8. The parent element of the background image has a height of zero or is hidden.

To troubleshoot the issue, check the CSS code for errors, confirm the file path is correct, check the file format and verify that the image file exists. Additionally, try clearing the browser cache, and if all else fails, ask for help from a developer or online community.