I just replaced my original Dell NVIDIA 32 MB AGP display adapter with an
NVIDIA GeForce4 MX4000 on a ASUS V9400 board with 128MB.
The computer is set up for 2 users, one with 800 X 600 resolution, the other
with 1024 X 768, both 32 bit color.
Everything works fine when starting from "cold" or changing from one user to
the other.
BUT when you shut down Windows with the RESTART option it shuts down but
hangs with a black screen and curser in top left corner.
After reseting with the front button it starts and sometimes wants to go in
Safe mode but forcing normal start allows either user to log on. However the
screen is only 640 X 480 resolution 16 color and there is a warning that the
Display Adapter is wrong or the settings do not work with it.
I have the latest video drivers and used DriverCleaner to ensure all the old
ones were removed first - trying to cure the problem.
I upgraded the Dell BIOS from A8 to A11.
One setting in the Dell Flash CMOS is Video Aperture size with a choice of
64 or 256MB. It used to be set at 64 and I have tried both settings but I do
not know which is correct.

Any ideas, please.