Powerbook G4 15in 1.67ghz

we have been having a number of problems with this computer first is when charcher is pluged in it turns green then the orange color and say (Calculating...)
but doesnt change the other problem is the mother board stoped working so i did the bake trick and it WORKED !! so then i applied new thermal compound to cpu and gpu and it work but for some apprent reason the fans do not work the battery problem is not so important the main thing is THE FANS that cool it down have any idea fors this or do i need a new logic board by the way the logic board work an im using it write know to type
PLEASE RESPOND 
Jerry Fokas

Thermal compound application should really only be left to an authorized service center.  The application of too much, it becomes an insulator.  The application of too little, and the machine overheats because there isn't enough to cool it down.  Only an experienced technician would know the right amount to apply.

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