Well...After downloading a torrent file, my mac just froze (Not sure if the torrent file caused this). So I restarted the powerbook G4, and to my surprise, there was no "bong" sound that macs make at start up, and the log in screen won't pop up. It's just blank background screen. Is this a hardware problem or can a virus cause something like this? I would do a clean reinstall but I don't have the start up disc at the moment. Really would appreciate help thank you