I have a G4 running 10.4.11. Problem is HD won't go to sleep anymore. Started doing this a while back, but only if I had iphoto open. Now it does it all the time. Screen goes to black as it should, but HD doesn't sleep. Sometimes it sounds like it's trying, but it still runs. Here are the things tried so far: New battery Zapped the PRAM Tried different time settings for sleep Installed new system folder Run disc repair and disc permissions None of this has helped. It will sleep if I go to the pulldown and choose sleep, but again, won't do it on it's own.