So I've already had two logic boards replaced on my iBook G4 and now the warranty is coming up this January. Recently (it's happened a couple of times so far) the screen has just been going black. I can see the makeout of what was on the screen but it looks as if the brightness were at the bottom setting. Nothing resolves the issue except restarting the machine. What is wrong with my computer and I am also nowhere near an Applecare center so I am not even sure what I could do if I figure out what is wrong... Well I hope someone can help me out -- thanks for reading and trying to help.