I have recorded many videos on my Fujifilm FinePix S4200 camera, but I can't seem to hear any of the videos as I'm...

It may be that there are dust particles or smudges on the lens of the camera or the LCD screen itself. You can try cleaning your camera with a clean cloth; however, if that does not work you may want to try and hold still while you are taking the picture. Sometimes people move before the picture is actually taken, whether it be the people in the picture or the photographer, try and hold still until the picture is fully processed. For further reference on this topic you can check out our troubleshooting page: Fujifilm FinePix S4200 troubleshooting