Alternating shades of blue on TWO laptops...

I have 3 Macs on an AirPort network -- a G5 iMac, an early '08 MacBook Pro and a G4 PowerBook. All have been running 10.5.6 problem-free since the update first came out. Yesterday, performed a restart on the G4 PB and it hung on a screen that alternated between a dark blue and light blue, with the wheel spinning every 6 seconds. Performed a restart on the MBP, same result. The iMac restarted without a problem and is working fine. The only thing I had been doing earlier with the 2 laptops was screen sharing off the G4 PB, but I had already quit it.
On both laptops, I was able to restart in Single User mode and perform fsck. Both were diagnosed to be okay, but with the statement Some Files Were Modified, so I performed fsck again and rebooted. Same shades of blue on both. Reset PRAM on both, same result. Reset PMU on both, same result. Could not boot into Safe Mode on either machine (same blue screen), so beginning with the G4 PB, I inserted the Install disk to attempt to verify permissions. Disk Utility stopped immediately with a message No Valid Packages. Decided to Install and Archive and was successful on that machine.
No such luck on the MBP. Verifying permissions returned the message "The underlying task reported failure on exit." Because I now had a good machine, I rebooted the MBP in Target Mode and deleted the LaunchServices files other posts had pointed me to. Same shades of blue. Decided to Install and Archive, but all I got from that was a message early in the install showing a yellow triangle with an exclamation point and "Mac OS X could not be installed on your computer. The installer could not install some files in "/Volumes/harddrive." Contact the software manufacturer for assistance," along with an option to restart and try again.
I'd show you some log entries, except I can't get to my login screen, much less my desktop. As I stated earlier, both machines have been running 10.5.6 flawlessly for a while now, no new software or extensions installed and the only thing going on between them was Screen Sharing off the G4 machine. Thanks.

Today I got the same on trying to restart after an antivirus update. I still can't restart on my internal drive, but after starting up from the install disc have managed to restart from a cloned OS 10.5.5 on my external drive. When I try to restart from the internal drive I just get the alternating shades of blue screen and nothing else - no error message, no question mark, just the pulsating blue screen!!!!

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