I have this setup for quite a while now (10 months) and lately I get this problem where my computer don't start. Actually, everything seems to be working expect that I dont get anything on my screen (keyboard/mouse don't start). All fans are on (3d card too).
Did you update bios lately? If so, clear cmos and load bios defaults.
So it's a blank screen no-POST issue. Oh, your ram is fast.
Unplug power cord for 5 mins, remove all ram, remove batter, clear cmos, install battery, try each ram stick in each slot, hook up power cord, power on. If no post, repeat this step until you exhaust all ram configs. Once pc posts, set up memory to 5-5-5-15@email@example.com.