No contact to monitor over GPU

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Oct 18, 2013
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Hi guys..yesterday I had a sudden BSD while playing a game,after that my screen was black but I could hear the windows music in the background..I checked the cables everything was ok.Then i pluget the cable in to the motherboard intergrated gpu and it worked..What could that be..is my gpu dying?..the fans are working and the green light on the power plug is showing...any help?