No display when boot from DVD

NVIDIA GeForce 6800 Ultra
30" Cinema HD Display
When I attempt to boot from DVD to run the Hardware Test, the display does not light up. The monitor's power light is on but the display is black.
What might cause this? How can I work around it?
Dual G5 2.7 GHz   Mac OS X (10.4.7)   4 GB RAM

Ah well, as is often the case, shortly after I posted the question the situation changed...
I tried booting from the DVD one more time. This time I left the DVD in the machine and used "Restart" instead of a cold restart. It booted fine. Yeah! I guess the monitor stayed in sync or something.
So the Hardware Test was run, terminated normally and reported no errors. Which is good news.

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