Post originale di: originalmachead ,
'''Yes''' you could be ''overlooking a fuse or burned/shorted components or connectors''. Unfortunately some of the cleaning may have removed burn marks that would point to the damage. Usually you have to go over the board with a magnifier looking for burn marks or swollen components. I am not certain if these models had a fuses (some models do). You'd probably need access to the test unit that the factory runs on boards to find the problem so, IMHO, ''the only DIY repair would be to''' replace the logic board'''. . . ''which may not be a complete loss as ''you could put the fastest board/processor for that model sequence in as an upgrade.'' ''If this Answer is helpful '''please remember to return and mark it '''Accepted.''