No Signal On Vga Tv To Computer Connection

I have been watching my computer screen on tv for two weeks, then all of a sudden it says no signal. We changed the cable back to monitor and the screen was fine, (i disabled my screen-saver so its not that). So when i change back to the vga, it works on tv again for a while then pops up no signal, and we have to go through the process of swapping cables again before it will work. How do i prevent this please?

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