When trying to boot with both sticks in either configuration or a single stick in different slots, it didn't work but gave a code 53 on the Dr Debug display (no useable memory detected). I also tried booting with no memory installed, and still got 53 (even though there is a different code for no memory installed).
I know you're about to say bad motherboard, so here's the twist. Two weeks ago I RMA'd the mobo for a replacement, popped it in, and got the same error.
Now I don't know if I got two bad sticks of memory, or if I somehow broke both of them, or if I got two mobos with the same problem. I still have time to return the memory if I need to; what should I do?
I would have to question if the ram is seated all the way in the slot. It's a common mistake, especially if the notches are a tight fit. You may have to return the ram to corsair, or sell it on craigslist and try another brand.
You were both right. The memory was a very tight fit indeed. On a closer inspection I saw the clamps weren't all the way closed. I had to lay my tower on its side and really push, thought I was going to crack the mobo but finally got the memory to click all the way in.