Memory Ok! succeeds in system booting! = means the ram was checked against bios setup and memory failed at DDR1866 and the bios reset to DDR1600. Does that bios have the latest feature where pressing F12 in bios will save a screen caputure of what is shown on screen? You need to see if that early board has that feature and how to use it. How to format the Usb stick etc. IF not can take pictures as you did of what we need to look at.
I tried to restart the PC and tried also to press F12
and this only shows: Screenshot #1
What you mean? What I did was just to disable the greens and manually sets the RAM frequency to 1866 and turned the Ai Overclock Tuner to "MANUALLY".