I'm not saying that it's your psu but it could be, there are some people having problems with this board, have you tried different ram? I had problems a few weeks ago with my new monitor, 1 hdmi monitor and 1 displayport set up as multiple devices in the nvidia control panel and it won't work with both on.I had to disconnect the displayport and use the hdmi monitor to get it to boot then switch on the displayport monitor and disable the hdmi. It could also be that the ram doesn't like the new cpu/motherboard combination.