FLV Video Not playing using Media Playback

[font=verdana, arial, helvetica][size=2][color=#4f5044]I am using Flash MX 2004 Pro and I have added the media playback component to a layer in a scene with several other layers. Using the component inspector, I have linked the corresponding flv file which resides in the same directory as the fla file. I have utilized several tutorials and followed every step. In fact, when I open a new fla and follow the same steps, the movie plays perfectly. It is only in my website in the particular scene that it won’t play. When I test the movie (or publish it), it only displays a white box with Player written on it. Is AS Necessary? I thought you only had to add the media playback component and using the component inspector to set the url to the flv file and it will just play. What am I doing wrong?[/color][/size][/font]