"Any easy way to repair constant "insert sim" restart?"に関する回答Hello! SIM cards can fail sometimes, even after short life (it happened to me). Before gutting the phone, I think you should diagnose a bit : test it with a SIM card that's known to work. Ask a friend/relative/colleague to borrow you theirs so you can test it in your phone to make sure wether the problem is the SIM card or the device. Good luck!
"Battery, charger, or DC in board defective?"に関する回答Maybe the adapter isn't geting enough juice out. The original Ibook G4 14" charger is a 65W... Maybe 45 isn't enough to charge the battery (I remember reading there were issues like that with the "airplane adapter" : enough juice to run the mac, but not to charge it) My 2 cents.... Good luck! :)
"testing faulty DC-IN board"に関する回答Hello! I had exactly the issues described by Jtsantos7 several months ago. On top of it, there would be sometimes a rather scary buzzing noise. The diagnostic was rather easy: when I dismantled the DC-In Board, I just had a look at the welds (a magnifying glass will help), some were cracked and one was even burnt (board toasted to a crisp). I re-soldered (more or less... hard to do on burnt circuit) everything the time to receive the spare from here (I really needed the laptop). Good timing, as the weld on the "fried" part started to fail again just when I got the new DC-IN board. Good luck with your fix