I have the same scenario that this user so excellently delineated on his "black screen of death" experience.
Ultimately the crux of the issue seems as though there is no way to bring up safemode or bypass the drivers.
The only thing that comes to my mind is manually disabling the video driver so as to force Windows into using a default driver in order to then get into Safe Mode to then rollback to the previous driver.
How would one go about manually removing a driver once you have such a system's drive removed and able to be manipulated via another workstation?
