As I wrote in the beggining if I plug it directly to my TV there is no problem. I can enter the bios, and POST screen is in fulhd. But whe signal goes through my yamaha the post is in verry low resolution and when I try to enter bios I just get blank screen. I don't have any issues with other of my gear (that is xbox 360, ps3, sony smp-n200, cable dvr that are plugged also via hdmi).
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