In most cases, the reason a video won't play has to do either with your internet browser or the speed of your internet connection. Here's a few things you can try to resolve the issue.
(1) If the video won't play at all, then make sure your browser is updated to the most recent version. Also, make sure you do not have any Ad-blocking software installed. Some ad-blocking software will prevent videos from playing.
(2) If the video plays, but it stops every few seconds and just can't seem to play through completely, then the issue is probably your internet browser. Try pressing the PLAY button (usually looks like a right-arrow) and then wait a couple of seconds and press the PAUSE button (looks like an Equal sign = ). Then wait a while and eventually press the PLAY button again.
Usually this will allow the video to load for a while, then when you press the play button again it should be OK.
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If you've tried all of the above, and you still can't get the videos to play, then please contact the Help Desk and let us know exactly what kind of problem you're having, including any error messages you may be receiving.