No Signal Message

Hello,
Over the last few days I have a no signal line on my monitor, and the screen goes black. I have changed both monitors and computers. Could this be some thpe of virus or just bad luck. One computer is XP and the other Vista. I have changed to a ACER monitor. The XP does work for a short time in safe mode
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More about signal message
  1. Are you sure it's not the cable? I've been having the same problem lately and I've identified the cable to be one of the issues.
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