Possible causes of video signal lose

Hello Everybody,

I have lost the video signal to my monitors, I was using the computer normally when my screens went black (no bluescreens or weird stuff) pure black.

SO what can cause this to happen.

I believe is not the Graphics card going bad because I put in a new one that I know works. So what could be causing this problem?

Thanks.
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More about possible video signal lose
  1. just unplug the video output cable from the cpu and turn on the monitor to see if that shows any message saying, " the cable is unplugged,plug in...."(something around those lines)
    this will let you know if the problem is with the cable or the monitor.
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