Black screen when change res in hdtv via mini hdmi to hdmi on gtx 570

i just purchase evga gtx 570. i connect my gpu using mini hdmi to my hdtv(mini hdmi to hdmi). i set my resolution to 1080p 60hz which is the highest suppoerted by my tv. when i try to run certain game in full screen, my tv changes to vga resolution(there indicator everytime when my tv changes resolution. i dont know exactly the resolution it changes to) and the screen just turn black. i dont have this problem previously when i use 9600gt using dvi to hdmi.

how can i solve this? tried google and tweaking nv ctrl panel but still...

thanks.
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  1. nevermind. installing beta driver solves this problem
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