Sysprep'd Images Hang on Certain Models

[Thoughtcrime]

I currently have a sysprep'd Vista image sealed using sysprep /generalize /oobe /unattend:myfile.xml

This image works fine if I deploy it onto Dell Latitude D820 (reference system it was built from), IBM Thinkpad G41, and IBM Thinkpad T60.

When deploying to a Thinkpad T40 and T42 it simply hangs when booting.

Enabling boot logging doesn't generate a log.

Booting into Safe mode shows it loads all the drivers apparently as crcdisk.sys is the last loaded driver.

I can install Vista manually on the T40 and T42 and it installs fine.

Does anyone have any ideas what would cause this?