One of the main reasons why YouTube does not work is that you do not have a stable internet connection. If your Internet connection is slow or unstable, you may not work properly. So make sure you have a good internet connection before trying to watch videos on YouTube. Another reason why youtube may not work properly is that your cookies and your cache are not up to date. Cookies and cache can prevent youtube from working properly, as they can block certain files necessary for the proper functioning of YouTube. So make sure your cookies and cache are up to date before trying to watch videos on YouTube. YouTube may also not work properly due to a problem with the browser you use. If you are using an obsolete browser, you may not work properly. So make sure you use the latest version of your browser before trying to watch videos on YouTube. Finally, YouTube may not work properly due to a problem with the YouTube site. If the YouTube site is broken or if there are server problems, YouTube may not work properly. You can check the condition of the YouTube site by going to the company’s website and by clicking on the “Site status” tab.