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Released in October 2003, the iBook G4 replaced the iBook G3 as Apple's portable consumer computer. The iBook G4 was sold in 12" and 14" models and updated for the last time in 2005.

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How to unlock fn key?

My fn key is pressed by default, like when adjusting the brightness of the screen (fn + f1) I just need to press f1. I tried all the solutions posted on the internet ( hold fn + various keys or press fn for 10 secons) to no avail. How to unlock this key so I can use my f1-f12 keys without pressing the fn?

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My current OS is Ubuntu Server 14.04 so I can't access the system preference

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Have you considered that maybe it's a problem with the hardware?

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It worked a week ago though. I haven't tweaked my iBook that much so I don't think that is the cause of the problem. I tried resetting the PRAM, still the fn key is reversed.

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Ker Artiaga will be eternally grateful.
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