To find out why is Gmail not working, you are supposed to follow and apply few important steps and instructions. Now, to fix it, you should close and reopen Gmail, and then try to open Gmail in another browser. Now, you must check to see if Gmail is down. Now, you should clear your Google storage space. Now, you must make sure that you have a strong internet connection and then restart your computer and then you should disable your browser plugins and then clear your browser cache.