Hi all, Every few hours I notice a strange siren type noise, its is fairly low volume and it doesnt come from the speakers. The noise kinda sounds like a police siren and goes on for about 2-5 seconds. It is running OS X 10.3.9. I am just curious what this noise is and what it means. There are also some other strange things going on with my powermac, such as: It takes a long time for the video card to send a video signal to the monitor while starting up, the screen is black until the login screen shows up. There is also no startup chime.