Last year when I was upgrading to OS X 10.4.6 I found I had a bad ram chip, which I replaced. I was then able to load 10.4.6. Since then I've had problems. Computer (G4 dual 864) runs fine until I leave it alone and it goes to sleep, or if I put it to sleep. It will either not wake up, or when woken will not act properly. ie sluggish functions in finder won't work or work properly etc... I've reloaded the software, repaired permissions, zapped pram. Any Ideas?