X240 with 2 ThinkPad Pro Docks not detecting screens

Hello all 
I have a Lenovo x240 with 2 ThinkPad Pro Docks one for the office and one home 
In office I have, a screen connected to dock via DVI port and its working fine 
In home, i have a screen connected to dock via vga port and this one is not working ok 
The computer does not recognize that a screen is connected. i checked it with 2 different screens with 2 different via ables. 
It will work only if I connect a screen with DVI port. 
Please your help 

What did the folks at Line 6 and Apogee have to say?
Clinton

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