Thanks for your response!  I do believe it's plugged in correctly...  I can even switch the video cards and it still won't boot. 

Here's the PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182039
Here's the CPU: http://www.newegg.com/Product/Product.aspx?Item=N82E16819103194

I'll toy around with it some more, maybe I just need to find the right combination of cables plugged in where...