Not sure if this is the correct place for this posting or not, but here goes. I think my iMac is possessed. At very random times, it starts playing techno type music. I have closed all open applications, and this doesn't seem to stop it. I am at my wits end here. My brother in law is now living with us, and was caught downloading porn a week or so ago, and I am concerned that it may have been the cause of this seemingly random music playing. I am not sure where to look, or how to figure this out. Again, I have closed all open applications, but still hear the music. It generally plays for 5 minutes or so, and stops as mysteriously as it begins. PLEASE HELP! Any suggestions, would be very appreciative.