Thinkpad Advanced Mini Dock (250410U) Display Won't Extend [ Edited ]

[corbin31]

I have a T400 (2764 CTO with a Radeon HD 3400), an Acer 23" monitor, and an Advanced Mini Dock (Part 250410U, Model 2504). I am trying to extend the display from the T400 to the Acer monitor through a VGA cable. When I plug the monitor directly into the laptop, the display extends. However, when I dock the T400 and connect the monitor to the Mini Dock, I can't get a signal to the monitor. Any thoughts? Thank you.

[Serge1410]

hey corbin31,

welcome to the forums.

for this, have you updated the BIOS of your T400 ? this could help.

anyway, the Acer monitor that you're using, is it one of those monitors that needs a separate power supply or is it one of those which can draw power from the VGA cable ?

another thing you can do is to check at http://support.lenovo.com and see if there is any graphic driver updates for your unit.

[lead_org Microsoft MVP Contributor · Accepted solution]

does the same behaviour occur with the Intel GPU mode?

[corbin31]

I played around it with it some more and I didn't have the laptop pushed far enough into the dock. It seems there are two points at which the laptop clicks while pressing it into the dock. I had already updated the BIOS and now the display extends in Intel GPU mode and with the Radeon. Thanks for your help.