T420 display won't work while docked

My laptop is a t420 with a Mini-Dock series 3. I have one monitor attached to the dock's VGA port. When I first attempt to use the laptop with the dock, nothing outputs to either the LCD or VGA display. If I power down by holding the power button and power back up, it works normally. I have tried changing the boot display in the bios settings from LCD to VGA with no change. Does anyone know of a fix for this?

hey en10411,
i would like you to update the bios as well as the firmware of your T420 from this link >>
http://www-307.ibm.com/pc/support/site.wss/MIGR-77167.html
once done, test your docking station again.
WW Social Media
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