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Blue Screen Again
Posts: 2
Registered: ‎09-23-2011
Location: USA
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Accepted Solution

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

[ Edited ]

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.

Retired Employee
Posts: 2,437
Registered: ‎04-10-2011
Location: Malaysia
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Re: Thinkpad Advanced Mini Dock (250410U) Display Won't Extend

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 and see if there is any graphic driver updates for your unit.

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Posts: 20,914
Topics: 128
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Registered: ‎12-19-2008
Location: Australia, Melbourne
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Re: Thinkpad Advanced Mini Dock (250410U) Display Won't Extend

does the same behaviour occur with the Intel GPU mode?

Jin Li

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Blue Screen Again
Posts: 2
Registered: ‎09-23-2011
Location: USA

Re: Thinkpad Advanced Mini Dock (250410U) Display Won't Extend

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.