HELP! 10 minutes (!!) freeze during boot-up

[74aki]

Strange, really strange...
X200s, 7470.
Linux liveCD (Arch, LUbuntu, Gentoo, RHEL, ...) boots fast with no errors (I checked dmesg twice), works OK.
Installed Windows XP Pro boots fast with no errors, works OK.
I tried to install Windows 7 Pro twice and the same problem occurs. After displaying "Starting Windows" and Windows logo the notebook "freezes": for 10 (TEN!!!) minutes nothing happens. Logo is blinking, "Starting Windows" is displayed as for normal boot but HDD is calm, mouse is off, CapsLock, NumLock give no result, closing the lid -- the same, ... After 10 minutes it continues booting (fast) and works correctly and with no errors. No errors in logs.
I tried numerous BIOS setting (with disabling whatever possible), tried other Windows 7 installation CD, tried to disable extra devices, install Lenovo patches, Microsoft updates -- always the same.
Had no such problems with my other T400 and never heard about such an issue.
Seems like something with BIOS, timeout in activating sth., ...? I have completely no idea how to debug it.
The notebook is under warranty but is it really a hardware issue? Maybe BIOS? Maybe a new feature from Microsoft? Any idea how to guess it?

[BootSectorVirus]

W7 with SP1?

Where did you get the install disc?