I wanted to run FCP 4.5 so I upgraded from 10.2.8 to 10.3 then ran the updates to 10.3.9. I didn't to a clean install, just installed 10.3 over the old system. I didn't run repair disk permissions either.
Now my g4 (dual 1gig, 1 gig ram) which was always very, very stable crashes four or five times a week. with a screen I'd never seen before. I'll leave the computer and come back and the screen is dark with a box with the on/off button logo and in three or four languages, "You need to restart your computer. Hold down the Power button for several seconds or press the Restart button." I'd never seen this in two years of my G4 with 10.2.8 Now I see it several times a week. I'll render a DVd get it, Working in FCP get it. It's driving me nuts.
I'm thinking a clean install (to 10.3)(wiping the drive) and using 'repair permissions' and upgrading to 10.3.8. Would this help?