Your YouTube may not be working due to several common reasons including technical issues on YouTube's servers, scheduled maintenance, internet connection problems, or device and app issues such as outdated software, cache buildup, or app glitches. To fix it, first check your internet connection to ensure it is strong and stable. Restart the YouTube app and your device, and update the YouTube app and your device's operating system to the latest version. Clearing the app's cache and data can help resolve temporary issues. If using a browser, clear cookies and cache and disable any problematic browser extensions like ad blockers. Also, check if YouTube is down through platforms like DownDetector. These steps usually solve most YouTube not working problems.