Startup shows grey screen only.

PowerMac G4 dual 1.25 GHz.
Pulled all HDDs from machine so only the original combo drive is left. Attempt to boot Tiger install disc and I get a grey screen with the Apple logo. I boot the supplied hardware test disc and it boots up and runs the tests in a loop for several days and doesn't report any errors.
Any ideas on what I can try?
Thanks,
-Mark

When I boot from a HD (which I put back into the machine):
Darwin Kernel Version 9.2.0...
(I have to type all of this in since I can't copy it so please excuse typos, I'll try not to make too many)
MAC Framework successfully initialized
using 6553 buffer headers and 4096 cluster IO buffer headers
ApplePlatformExpert::getGMTTimeOfDay can not provide time of day RTC did not show up
mbinit:done
Security auditing service present
BSM auditing present
rooting via boot-uuid from /chosen: 8E7E87B0....
Waiting on <dict ID="0"><key>IOProviderClasss</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string.<dict>
Still waiting for root device
Still waiting for root device
(this message repeats)
==========================================
When I boot from the Tiger install DVD:
standard timeslicing quantum is 10000 us
vmpagebootstrap: 316273 free pages
migtable_maxdispl = 70
Copyright notice
using 3276 buffer headers and 3276 cluster IO buffer headers
Extension "com.appe.driver.KeyLargoATA" has no kernel dependency.
Extension "com.apple.driver.AppleDACAAudio" has no kernel dependency.
Extension "com.apple.driver.Apple02Audio" has no kernel dependency.
Extension "com.apple.driver.Apple02DBDMAAudio" has no kernel dependency.
Extension "com.apple.driver.Apple02DBDMAAudio" has no kernel dependency.
Extension "com.apple.driver.AppleTexasAudio" has no kernel dependency.
Extension "com.apple.driver.Apple02Audio" has no kernel dependency.
Extension "com.apple.driver.Apple02DBDMAAudio" has no kernel dependency.
========================
Original 10.2.3 software and install disc that came with the machine:
standard timeslicing quantum is 10000 us
vmpagebootstram: 315704 free pages
migtable_maxdispl = 64
COLOR video console at 0x9c00800 (1600x1200x8)
IOkit Component Version 6.3
Wed Jan 8 19:08:03 PST 2003; root(rcbuilder):RELEASE_PPC/iokit/RELEASE
_cppInit done
IODeviceTreeSupport done
Recording startup extensions.
Copryright notice
using 3276 buffer headers and 3276 cluster IO buffer headers
we have cy2213
ATIRadeon8500: using AGP
ApplePlatformExpert::getGMTTimeOfDay can not provide time of day RTC did not show up
devfs enabled
IOKitBSDInit
From path: "/pci@f2000000/mac-io@17/ata-3@20000/disk@0:9,/mach_kernel", Waiting on <dict ID="0"...
Still waiting for root device
(and this last message repeats)
=================================================
I had to type these in on a different machine so please excuse the typos - I didn't put in the Copyright notice and I just noted the repeated messages.

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Step 5
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Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.
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Step 9
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