It's likely that the memory isn't compatible with the board. Asus boards can be picky about memory support and few 8GB modules work with them. And no, if the memory is bad, the board won't boot, not usually anyway. Next, remove your graphics card and try to use integrated graphics and see if you get anything from that. The mom_OK light on my board lights up when I start my system but that's normal. The fact that is is solid though means that the memory probably isn't compatible. I would recommend ordering a replacement Corsair 2 or 4 gig module and see if that works and if it does, you know the problem. Reason I recommend Corsair is that, I have never had an issue with Corsair compatibility in Asus boards but, that's NOT to say they don't exist, I just haven't seen it even when using untested memory.