Tesla s1070 preventing system post

Hi all,
I'm current troubleshooting my system not posting when adding the cables to link the host to the Nvidia Tesla S1070 enclosure. When the pcI cards are in the system but not plugged into the enclosure it works fine but when the cables are in, no post. As the motherboard does not have a display output im using a GT710. System fans kick on and hdd/power light.

Any help would be much appreciated!
System:
GIGABYTE GA-990FX-UD5 AM3+
AMD FX 6300
16GB corsair value ram
GT710
TESLA S1070 gpu enclosure