I have a PBG4 1.25GHz, in which the function keys on top of the number row have never worked except for the eject button. I have tried: a] Resetting the SMC b) Resetting the PRAM c) Reinstalling the OS, trying both Tiger and Leopard. d) Checking over all the keyboard/Assistive devices settings in System Prefs e) Swapping the keyboard over for another of the same generation PBG4 f) Swapping the power supply g) Googling for ideas Nothing has worked. The brightness control slider in SysPrefs is still there but I can't control it from the keyboard. Does anyone have any ideas what the issue could be? The PB has 2 good batteries and one wonky one, which sometimes charges and sometimes doesn't but the DC-in looks fine to me.