Niresh Mav 10.9.0 - Gigabyte GA-Z87-HD3 Haswell - Intel HD4600 vid
Both screens just mirror - can not get extended desktop - mother board has DVI, VGA and HDMI - I tried every combo output with no luck
Thanks - Louis
UPDATE: Figured it out. After getting stuck at boot DSMOS - grafix backup wiped out intel kexts and put me in VESA mode - I put intel kexts back and magically both monitors appeared.
Hint: VESA mode shows only 64mb in video properties - if configured correctly it should show 1024.