Quovadis

Hi, just bought a V71 and had great fun to put my X99 ultra gaming, H110 watercooling, 32Go ram, i7, 9 HDD etc. Everything was perfect until I realize that my 3 200mm fans wasnt working. I tried to connect them directly to mobo and it works, but when I use the front pannel supposed to control them nothing happened (no led is switched on). I connected the supply with the 2 pins molex to my mobo but nothing happens. Dunno why... I tried all connectioncs 3 or 4 pins on mobo, it works... Any help ?