Did a little too much maintenence - now I can't boot from my system drive

I figured I'd watch the Bears game this afternoon and do a little maintenence on my G4/733, currently runnint 10.4.9.
I booted from an older (10.3.9) system disk I have in the computer, Verified the disk (all was well, no repairs needed), then booted from my Disk Warrior (Tiger) disk and rebuilt the directory. Booted from the newly verified and rebuilt disk and it started up fine. Then ran Onyx and emptied several caches, including the system cache and kernel cache. Ooops, no longer boots...instead, I get the grey Apple screen, and then it just sits. When this happened the first time, I reset the PRAM by pressing the restart button six times...still no boot action.
The drive mounts fine, and so I'm in the process of copying the entire volume over to an external drive before performing any more maintenence. I can't do an archive and install from my supplied OS disc, as it's a lower OS version than I'm currently running. I'm loathe to do an erase and install, as then I get to perform the always-painful "make the computer work like it used to" process. And, the maintenence steps I've taken on this drive are nothing I haven't done recently on my other two Macs (both now running 10.4.10), both of which are running fine. So I'm still classifying this glitch as "minor".
Any suggestions out there? I'm gonna try to repair the disk again, and then run the OS 10.4.10 upgrade, unless I hear different from anyone here. Idears?

I had a similar problem. A mac started doing wierd things like not starting. All the tests showed no problem except one..I ran TechTool and did a full surface scan. It showed some bad blocks. The only way to repair was to clone to a back-up----erase and zero out the whole drive---then restore from the back-up.
That cured it....even a disk utility did not see the error.
Bad blocks can happen anytime, it may be no big deal but if this is your problem check it every so often and if more start showing up....start shopping..
Cheers,
Glynn

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