Does your RAM show up on the compat list for your motherboard? Worth a look at any rate.
Generally speaking, that typically indicates 4 primary failures (assuming you're using the spec settings from the manufacturer): 1) bad RAM itself, 2) bad DIMM slots on the motherboard, 3) motherboard is out of spec (due to bad components/firmware or you got one that sampled on the outer fringe of "good"), or 4) bad power supply. If you set your RAM settings to 1600 with just two sticks, will it post? How bout two sticks in the other pair of slots?
[edit] Another possibility is you overloaded one of your PSU rails, such as putting too many HDDs/SDDs on the same connector rail.
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