So I have a G4 macbook that I bought in 2004 and its having a big issue! I stepped away for all of 10 sec and when I came back the macs fan went into overdrive and the screen went dark....and then I started to smell burnt rubber. I turned off the book and gave it a few min to cool down, now evertime I turn on the macbook the fan just kicks on into overdrive and I hear nothing else no harddrive or processor in it. So I am hoping that anyone can give any ideas to what this could possibly be. Thanks for looking!