Hi, I just received a used 17" 1Ghz Powerbook G4 that I bought on eBay. Upon booting up, after the grey screen with the Apple logo, the machine starts flashing different crazy things on the screen for a second or two before the blue desktop comes up. The machine seems to function normally after that. Does this have something to do with a faulty logic board? It has happened on both my boot-up tests so far. TIA.