Why is my mac secondary screen not showing up when I bootcamp? iMac (27-inch, Late 2013)

I have installed Windows 8 using Bootcamp. As soon as I did and opened Windows finished the install, made my profile etc...  But then I realized that my secondary screen was black and the power indicated it was turned off. I have looked and searched with no avail i have tried to restart my computer, update both Windows and mac, unplugged my monitor and re-plug it in and have tried switching the channels/settings on the monitor itself. Please help me this really bothers me.

If it's connected via a Thunderbolt port it won't work in Bootcamp. Last spring I bought a new iMac. I have some earthwork 3D model building software that is Windows only. My Late 2012 MBPr 13" OS X/Win7 worked great with dual monitors using the HDMI port but the big screen/little screen is challenging. After trying most of a weekend to get the iMac to work I finally came across something that said Thunderbolt not supported in BootCamp and the iMac had no HDMI port. Returned the iMac and still using the MBPr.

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