remove all hdds.Install u r ram. change cmos battery its just cheap.try in old graphics card.then try in new one.remove both gpus if the board has inbuild hdmi plug moniter in that then try. insert gpu in other slot x8 or x4 then try. if all not works try changing ram to new one or test in other system u r ram is working or not. if all failed then u get same issue u r mobo is problem.change mobo or if its in warenty period contact manufacturer for replace u r mobo.