What would cause a video loss on a bunker hill camera?

I hooked up three of the four surveillance cameras. The two outdoor cameras are now not working. The connections are good. They worked for a few days. The monitor shows "video loss".
Asked Jul 14, 2014
this video will help you http://www.youtube.com/watch?v=PPSYDQBAtKg
Answered Jul 15, 2014

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