So ...
Things that didn't work:
Reinstall of stage 2 /boot/boot
Lowering ticks of BootEasy down to 1 tick
Replacing BootEasy by installing /boot/mbr
So, I thought to try to enable fast boot in BIOS ..., it already was.
Just as a last shot, without too much optimism, I've disabled it ...
It worked!
;)
Domagoj Smolčić