Warning:
DVIator, Mac OS 9.2.1, G4 Built-in DVI video and 17" ADC Display.

Users with a 17" ADC flat panel display who use DVIator with the built-in
DVI video on a Power Mac G4 should not install the new Mac OS 9.2.1 update
for now! The updated video drivers in 9.2.1 can render the 17" LCD unusable
in this configuration.

Only users with exactly the above combination of hardware including the 17"
flat panel display are affected. Dr. Bott is working with Apple on a final
solution.

Work-around:
Users with a 17" ADC flat panel display who need to install the Mac OS
9.2.1 update should follow the guide lines detailed here:

http://www.drbott.com/prod/dviatorfaq.html#Anchor-Important-49575

They will find an easy procedure that will permit immediate installation
and use of Mac OS 9.2.1 despite the above issues.

Clarification:
This issue does not exist under Mac OS 9.1 or Mac OS X for the 17" monitor.
Users with a third party DVI card (such as ATI's Radeon) or running a
second display should not experience these problems. Users with a 15" or
22" ADC display can install Mac OS 9.2.1 normally.

Only the specific combination of DVIator, Mac OS 9.2.1, the built-in DVI
video card and 17" ADC Display can trigger problems. It is possible that
the screen stays black after installing the update and you will need a Mac
OS 9.1 CD or a second monitor to revive your system.

More information about DVIator can be found at: http://www.DVIator.com/