Yesterday, out of the blue, my G4 started making a very loud humming noise. I had several programs open, nothing froze but I was unable to shut down from the Apple menu so I rebooted from the harddrive. The sound was gone and I have not heard it since. However, when I start up my computer now, it no longer makes the little Apple start up sound. Anybody know what happened?
I know some G4s have noise problems. Mine sometimes makes an irritating sound but never for very long. This was different...almost deafening!
I wonder if you have the "wind tunnel" G4 that sounds quite, um, loud. The hum could have been the fan cycling on and causing some internal vibration. Curious what happened too that the apple bong sound is gone on startup.
Did you open the case, and see anything out of whack?