A - In most cases, the reason you can hear the video but not see it is because you do not have the correct software or codecs installed on your computer. This is an easy fix. Simply download QuickTime (Apple.com/Quicktime) or VLC (VideoLan.org). For Windows, you can also Google "k-lite codec pack", then download and install it. For Mac OSX users, install Perian component (perian.org) .