Blue or grey screen on boot

Mac Pro 1,1; 10.6.4
On attempting to start up recently I got a screen in alternating shades of blue.
Trying to boot to a bootable CD gives me a 'you need to restart' grey screen.
Booting to the diagnostic works and finds no problems.
Booting in firewire target mode allows access to the HD and repaired some errors with diskutility but did not change symptoms. Subsequent checks show no errors.
Booting to an ubuntu livecd worked fine with generic graphics drivers (up to date drivers available but require a reboot).
Booting into safe mode has the blue screens alternating with a black screen with a white rectangle in the top left (about the size of an old terminal cursor).
Zapping PRAM doesnt seem to change anything.
Recent upgrades include +4GB RAM which I have removed and errors remain with the original 1GB RAM (2x512)
I have also replaced the graphics card recently, GT 8800 stopped working and I replaced it with another GT 8800.
The help pages on blue and grey screens seem to be mutually exclusive but both discuss removing peripherals and non Apple hardware.
Per above, I have tried the diagnostic/safe/boot CD options mentioned in both and the only option I cant try is removing the graphics card (unless there is a way to test a successful boot without a screen?)
I suspect it is either a graphics fault which ubuntu doesnt mind but OSX does, or a more complex disk corruption.
The next option appears to be erasing the disk with firewire/diskutil and attempting a fresh install (not sure why this would remedy the kernel panic on booting from CD).
Some logs have been populated in Library/Logs/DiagnosticReports, I can post fragments as required but am unable to interpret atm.
Any suggestion appreciated.

HI,
Trying to boot to a bootable CD gives me a 'you need to restart' grey screen.
That is what is referred to as a kernel panic.
Go here for help to Resolve Kernel Panics
Carolyn

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    Ok, I've uninstalled both VMware and MacFUSE using the documented procedures taken from official websites.
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    Mar  1 11:06:37 localhost com.apple.launchd[1] (com.apple.sandboxd): Unknown value for key POSIXSpawnType: Interactive
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    Mar  1 11:06:41 localhost kernel[0]: AppleACPICPU: ProcessorId=1 LocalApicId=1 Enabled
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    Mar  1 11:06:41 localhost kernel[0]: The Regents of the University of California. All rights reserved.
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