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Thread Starter 
When I try to change "screen refresh rate" to 60 Hertz at 1080p resolution, the screen turns black.
24 Hertz at 1080p is the maximum rate I can get screen.
How can I get screen at 1080p with 60hertz.

HMDI to HDMI (version 1.4) is used.
AMD Radeon HD 6850 graphic card is used.