I have the same computer and it started doing the same dang thing about 3 weeks ago. I noticed it after “upgrading” to 10.4.7. Initially, i thought the problem was iTunes, so i stopped using iTunes. The problem didn’t go away, so i disabled the nifty desktop picture changer. Now it’s worse than ever!
Sonnet Tempo Trio
2 Seagate 300GB HDDs plus the original 80GB HDD
2 Kingston 512MB memory sticks
2 displays – Apple 17″ cinema & Envision 19″ CRT
What I’ve tried:
Zapped PRAM
Reset CUDA switch
stopped using iTunes (trashing prefs didn’t help)
disabled desktop picture changer
trashed display prefs
TechTool Pro & defrag
i’ve run disk utility about a thousand times
none of this stuff helped. I haven’t started yanking hardware, but that may be the next step.
I didn’t notice this until i upgraded to 10.4.7 and iTunes 7. And my problem is that it’s intermittent. Like you said, sometimes it runs all day with no problem, sometimes it freezes after 10 minutes.
If this keeps happening, I’m going to fidget with the memory and possibly a different fan.
Like you, I bought this thing because I have things I need to do on the computer. If I can’t keep it from freezing, I may as well get a Dell.
Please keep me posted and let me know if you discover anything.
-caleb