I missed the bit where you said what the mobo is. I looked up the mobo in your carpc specs under your name on the left (j7f2we1g2e), but that doesn't have an i915 chipset. I looked up the two links in your sig but all I got was some pictures.
If your mobo kicked out low voltage sync (3.3v instead of 5v) then the monitor may have trouble detecting that. I think I remember that some motherboards do this, and some monitors have trouble with low level sync. Not knowing which mobo you have and having a hazy memory about the specifics of the problematic system in the past definately doesn't help things here.