G5 Black & white video when booted from install DVD

It has been years since I installed 10.5 on our G5 so I can not remember if this happened back then but think it did.
When I boot from an install DVD (both the original G5 DVD with Tiger and the MacOS Leopard DVD) the video output drops to 1-bit (dithered black & white) which makes it very hard to discern the text on the shaded buttons in the GUI. The video card is fine - when I hold down the Option key on boot to select the DVD the video is full-color, but as soon as it switches to running from the DVD the video becomes low-rez dithered b&w.
Anyone else see this issue and suggestions on resolving it? The display is a Dell 17" wide model. I don't have another display that is easily swappable to see if it's a problem with it or the Apple DVI-to-VGA adapter.
The G5 tower is a first-generation 2x2 (2CPUs, 2GHz) with 2 DVI ports on the video card (can't recall which card I ordered back then).

Great to hear, thanks for the report!
I suspect what happened, was that the Install also changed some PRAM or NVRAM setting, those are where number of colors are held.
Some earlier Macs store these settings in PRAM:
Status of AppleTalk
Serial Port Configuration and Port definition
Alarm clock setting
Application font
Serial printer location
Autokey rate
Autokey delay
Speaker volume
Attention (beep) sound
Double-click time
Caret blink time (insertion point rate)
Mouse scaling (mouse speed)
Startup disk
Menu blink count
Monitor depth
32-bit addressing
Virtual memory
RAM disk
Disk cache
http://support.apple.com/kb/ht1379

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