Hello, My name is Cris and I'm new to this Forum, and I ran into a problem with my Powerbook G4 last night.....while I was browsing, out of nowhere, a sound started, like a fan type noise, and it wasn't my fan for the heat sensor, the laptop froze on me and the "thinking wheel" just kept on going, so I powered it off and re-booted it, after the initial boot-up, the noise started again, but this time my screen didnt come up at all, as the noise persist, it would shut down and restart itself up but with the same symptoms. I'm not too familiar with the "insides" of my G4, I tried to do research and came up with a "Logic Board", "Optical Board", and my Hard Drive. I don't want to bring in my PowerBook for repairs and pay for somethng else. How much will it cost to repair or buy the new item??? Please, any help would be highly appreciated. Thanks. Cris.