Im building my first rig and im having the same issue over and over. I have a i7 920 processor and a evga sli3 board with kingston 4x4gb ram and a bfg 1000 watt psu using a readon hd graphics card. I get power but no display. I tired everything from one ram to no ram to a basic graphics card. could the psu effect the display. swapped with a lower watt psu and still not luck. the evga has a boot/temp display and it stays of FF which by the book means its booting. Thought it might need time since it is new but after an hours just does the same thing. I get no display at all. harddrive sound like there running. i have tried different displays including hd television. SO lost on what to do next.
i would pull the mb out of the case to see if you shorted it to the mb tray. also i check that the cmos jumper in the right pins and that on the mb header you did not place hd or power led on the reset pins. when you have the mb on the table if there no ram installed you should get a cmos beep code if you have a speaker attached. also on newer mb there a 4 or 8 pin extra block on mb that give extra power to these new mb if you dont have that connected it wont post.