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Installed 'Win7_64_152612.exe' then reboot machine, stil BLACK SCREEN. Tried with dual display adapters, no luck.
Then reset BIOS setting with mb's jumper, entered BIOS an 'Load as Default' option.
Now it loads Windows7 fine with the intel HD VGA driver!!!
Maybe something went wrong when updating BIOS, or some options/settings where stored wrong on eeprom/flash/nvram.