Lately I've been noticing that my eMac's speaker balance would change on its own, seemingly at random times. Does anyone know what the problem could be? I did a Google search and came up with this link: http://answers.yahoo.com/question/index?qid=20090712180559AAeMJBu Which says to try repairing disk permissions in Disk Utility and then resetting the PRAM&NVRAM. But do I select the hard drive or the Macintosh HD volume/partition to repair the permissions? And will I need my Tiger installation disc to do this? Do I risk losing anything when I repair the permissions?