If it is a movieclip symbol, it doesn't need to have any more than one frame in whatever timeline you place it in to be able to play in its entirety. What controls are you using to make it play? Does the movieclip have any stop() command in its first frame(s)?
No stop commands anywhere. I'm trying to make a flash animation, it won't play the movie clip on the timeline or when I test movie.
What controls are you using to test it? Using Ctrl-Enter should test it properly. If that's not working show screenshots of the main timeline and the animation timeline.