SAPPHIRE HD 5770 1GB PCIE

HEY :wahoo: I M USING DH55TC,I5 750 AND SAPPHIRE HD 5770 1GB PCIE.WHEN I TURN MY PC ON SOME TIMES IT FREEZES NO DISPLAY ON SCREEN AND A TINY RED LIGHT START GLOWING ON THE GRAPHIC CARD.WHEN I RESTART MY PC IT TURN NORMAL.I DON'T GET THAT WHEN FREEZING OCCUR'S MY SYSTEM IS IDEAL,IS IT TEMPERATURE PROBLEM.RECENTLY MY WINDOWS RATING IS DEGRADED FROM 7.4 TO 6.9 OF GRAPHICS AUTOMATICALLY.
PLEASE HELP ME ANY HELP IS APPRECIATED. :bounce:
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