When i turn on my mointor sometimes the screen will go black why?

Sometimes when i turn on my computer the system unit is loading and everything but the monitor will turn on and then turn back off. but the green light will remain on. i continue to turn the mointor on and off, and i mess around with the wires and eventually it works but i don't know why it does this?
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More about when turn mointor screen black
  1. sounds like you may have a loose connection
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Computers Windows XP