Just recently I've noticed that my iMac has been losing some sounds. It plays iTunes and system sounds okay (emptying trash etc.) but it won't play Quicktime movies and games' sound. It's pretty frustrating. I've repaired permissions and rebooted a few times but to no avail. I haven't installed anything recently to the best of my knowledge either. Anyone else getting the same? For the record, it's a rev B iMac G5 with 10.4.1 and I've got an iBook with exactly the same software and files on it but it's fine. Any help would be hugely appreciated.