Dual GPU problem

Alright, So I'm doing a school project where I'm trying to crossfire two XFX HD 7850s on an ASUS thunderbolt with a core i5 second gen. When I power up the system I only ever get one car to display video (i'm using HDMI on both cards and monitors) I took out the card that displays and plugged the other card in to see if It was the card but it too worked but only by itself. I made sure that all of the PCI-E power connectors were correctly connected and that the crossfire bridge was connected properly as well. Any help with this will be greatly appreciated.
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