Averian 0 Newbie Poster

My computer was working fine until yesterday night when I was using it and the screen suddenly turn black and showed me "check signal cable". I searched the net for solutions and most of them only occur when they start up the computer or when they leave it on overnight. As I am mostly computer illiterate, I can't really fix it myself but can anyone tell me what are some of the possible solutions and what are some of the possible situations that might have caused this problem to arise.

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