T540p+UltraDock+external display

Hi,
I'm having problems with T540p with latest bios update.
I'm using Dell U2713hm with ThinkPad Ultra Dock 135W (40A20135XX)
i have both the 170w and 135w adapters for dock. and my dock has a 2.22.000 firmware.
I have updated my nvidia and intel VGA drivers as it was recomended here.
now the problem is. when i put my laptop to the dock, win8.1 decides, that this is it and the screen goes blank and my external dysplay says there is no signal. i take ou of my dock and screen don't come back.
I do a hard reset(hold down the power button) put it back to the dock and start again. And again nothing, i take my t540p out of the dock and windows login screen appears. and that is when im lucky.
But i have dual videos, intel and nvidias 730.
and the same thing all of the time, tried different cabels and differed drivers and different adapter. send my laptop to my dealership and it came back .. still the same problem.
im trying to connect 1 screen using DP port1 and a DP to DP cable not nothing.
i have tried most of the things recomended in here, but what now ?

Hi Smotion123,
Welcome to Lenovo Community!
As per the query we understood that you are facing issues with External display when you connect to Ultradock station your ThinkPad T540p.
Have you checked if the Display is set to Discrete Graphic in BIOS – Config – Display option.
Hope this helps.
Best regards,
Hemanth Kumar
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