on my G4 450 AGP machine OS X.2.6, every so often - about twice an hour at worst, at least once a day at best the finder - and everything else that is open quits - the screen goes blue for a few seconds then it comes back up. WHATS THE DEAL? I now save what I'm working on all the time, so I don't ever loose much, but this is a pain. I've repaired permissions, run MacJanitor, dont the fsck -y thing... all to no avail. Any thoughts please.