Sometimes your videos will play but there won't be any sound. Sometimes certain websites will just not work. Sound like something you have encountered? Try these two solutions and I'm confident your issues will vanish.
Restart your computer. This fixes almost every issue I encounter.
Follow these steps to update the Chrome browser.
1. Click the ice cream cone in the upper right corner. (It looks like three dots.)
2. Click Help.
3. Click About Google Chrome.
Chrome on my computer is currently up to date. If not, this process would start the update.