How many logic boards needed ?!!

Yes. How many logic boards does a Powerbook G4 17" (1Ghz) need to work properly? Do they really have to be changed every year?
I bought this beautiful machine secondhand. About 6 months later the screen seems to fail (stays black) i can us it only in Target mode as hard disk. The consulted Repair centre concludes: new logic board! Then they discover it already had been changed 26/07/2004 ; merely a year ago. But no more garanty. It isn't fair that such a expensive part and repair is only garanteed foor 3 months. Cost of this reparation: more than 700 euros !!!!! Apple customer care: "sorry, we can't do anything to help you" Who can then?
Time to switch I suppose? What else can I do ??

Sorry to hear that - not sure if you have any recourse based on the fact that it has already been replaced. If you have an up to date AppleCare contract then I would think it should be covered. In general I would say that your problem is somewhat rare. If main board failures every 6 months were common across the entire product line - or even just a subset such as the 17" - then there woudl have been a class action lawsuit resulting in a settlment that woudl provide extended warranty coverage.

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