At this point if clearing the CMOS didn't help, you can try to press f2, f9 and f10 without using the display. If this procedure does not work you will need to follow the recovery update:
I did this almost 20 times, whetout succes.
FInaly i got picture on the screen, but from analog signal (VGA) from the HD5450 . The HDMI on the monitor was dead. I dont know how this is happend , but is true. There is the funnies part. After that i toke another Monitor with HDMI , and it works BUT:
When i install the latest video drivers for HD4k , the screen start blinking randomly. See.. i changed the HDMI cable , installed the previous version of this driver , but still the same bug. I dont know whats happend here. I just changed one setting in the BIOS on Primary video adapter and i got Blown HDMI and now blinking screen . No succes. When i put HD5450 and use HDMI Cabble , now works, but there is no point. My HD4k still not working. And i am not overclock the machine yet. So , my problem is solved , but still have issue.I dont know why this screen blinks , but is seems like HD4k is dead with the HDMI jack on the previous monitor. Confused... and big dissapoint from this board.
Best regards and thnx for helping.