I'm having the same issue so I just want to see if there is any update on this.
My hardware setup:
Intel Core i7-4770K
Asus Z87-PRO
Intel 530 240GB SSD
EVGA GeForce GTX 770 2GB
Got two new Dell U2414U (DP & HDMI) monitors with my original Dell 3008WFP (DVI) monitor. I start experiencing the cold boot issue and found out about this thread. When I remove DP connection from one of my monitor, then it will boot up properly (BIOS can find the 530 drive). It's a hassle to turn off the power of the monitor connecting with Displayport though. Help please!