Why Can't I Access the Intel Management Engine BIOS?

I have a Dell Precision Tower 5810 running Windows 8.1 Pro 64-bit.

My system has an Integrated Network Card (Intel Ethernet Connection 1217-LM)

You are supposed to be able to access the Intel Management Engine BIOS by pressing Ctrl-P when you see the screen that tells you to Press Ctrl-P to enter MEBx Setup - but that Screen never pops up when I reboot while taping the F12 key.

I have reason to believe that DHCP may be disabled in the Intel Management Engine BIOS & I need to enable it because my Fiber Optic ISP uses Dynamic IP Addresses instead of Static IP Addresses.