My iMac hasn't made the startup chime in a while. I never paid much attention before, until I realized that my volume was up on my computer before starting/restarting, but still no chime. I remember reading that the chime is an indicator that everything is working right, so if there's no chime, does it mean something is about to go wrong? I don't think I've had any serious problems lately, and I just did a clean install about a month ago. Please relieve my fears and tell me it's probably nothing serious.