Create the blinking light as a separate movie clip... a frame or two of the light on, then a frame or two of the light off. No Tween... rather a "hard cut" from on to off.... no stop action at the end and the blinking light will recycle.
Then add that movie clip into the main timeline as needed.
You had helped me the other day. Thank you again. I'm sorry, I am still learning the basics. I have never created a movieclip. I took my still of the light off in a seperate project just to test and put it in frame 1. I then took a still of the light on and put it in frame 5. I extended my frame to frame 9 to give it a little space. Selected both frames and converted to symbol. I chose movieclip. When I tested this it worked fine. When I went back into my original project and did the same it did not work and would not play the video I have on another frame.
To create blinking light movie clip:
1. create a "light on" image (in another program) the exact pixel dimensions that will be used in Flash.
2. create a "light off" image (in another program) the exact pixel dimensions that will be used in Flash.
3. import both images into the Flash Library
4. in your main Flash .fla, click "Insert" in the main menu, then "New Symbol", then choose the "Movie Clip" type (do not crate the movie clip in the main timline).
5. Now create your on-off blinking light in this movie clip. It has it's own timeline, layers, etc. and is completely separate from the main time fime.
6. Movie clip will now appear in the Library (it is not on the stage).
7. When you want to add this mc to the main time line, create a new keyframe (F6) and drag/drop the movie clip into the frame on the maine timeline where you want it.
8. give that mc an instance name down in the Properties panel.
Now you have a working mc that can be incorporated into the main timeline as needed.
When timeline gets to the frame with the video, remove the blinking light mc if you want, or leave it on.