The only fan header that is required to boot is the cpu fan, some won't boot unless it's plugged in and running. Try plugging your cpu fan in to the header that you have marked 2 on the picture. Looking at a photo on the biostar site, there is a changing picture at the top and one of them shows the cpu fan plugged into the header near the corner of the board right next to the 8 pin cpu power.
edit: you can see which header the cpu hsf is plugged in to, may have to wait a sec for the picture in the top right to change.
http://www.biostar.com.tw/app/en-us/....php?S_ID=351#