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If you just upgraded your Lenovo T400 to Windows 7 and have found that your laptop no longer recognizes the DVI port on your 2504 series docking station, here is what you need to do:

1) Download the ThinkVantage System Update 4.0 utility from Lenovo

2) Install the “Intel Chipset Support for Windows XP/Vista/7” package

3) Restart your computer

Now, the DVI port on your docking station will work and you will be able to use two external displays simultaneously.