T400 Win7/64 Advanced Dock -- External Monitor No Longer Comes When Booting

My configuration:
T400 (2767-14U)
Windows 7 64bit
256MB ATI Radeon 3470HD (switchable graphics running in "High Performance")
Advanced Dock (2503)
Lenovo D221 Monitor (using VGA cable)
I used the above configuration without issues for a year.
My problem:
I just replaced my hard drive, clean installed the OS and all applications, and updated all drivers and the BIOS using System Update. Since doing that, my external monitor no longer comes on when I boot my computer in the dock (lid closed). The only way I can get the external monitor to work is to boot my computer first, and then "hot dock" it.
As far as I know, all of my BIOS/Power/Graphics settings are the same as always.
Thanks in advance for any help!
Solved!
Go to Solution.

Maybe the BIOS setting for Default Display got switched back to ThinkPad LCD?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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T400 Win7/64 Advanced Dock -- External Monitor No Longer Comes When Booting

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