Hi Ann and welcome to iFixit Answers.
First, concerning your airport/bluethoot problem: the iBook G4 12" 1.33GHz model has a well documented problem with the airport/bluethoot slot on the logic board causing wireless\bluethoot failures, kernel panick events and airport/bluethoot card reported "uninstalled" by the computer. The problem is caused by a malfunction of the slot where the card is connected to the logicboard. The only solution is to take off the card and restore the wireless function with a USB wireless dongle (or replace the logic board = costly solution). You may try to take off the card and reinstall it then test the machine with the top case open doing an intensive job like playing animations in iTunes. If the wireless still works and the machine doesn't freeze or kernel panicks after a while then you should be OK otherwise take off the airport card, close the top case and use a USB wireless dongle.
Second: when you separated the iBook top case from the bottom case you desoldered the fragile power switch connector (small plug with blue and white wires) from the logic board. To restore the iBook electrical startup function those two wires must be soldered back to the logic board. It's almost impossible to solder the plastic connector cause the two solder points are under the connector but pretty easy to solder the two wires directly to the logic board. You can see the connector two contacts location on the logic board where the blue and white wires must be soldered. It's micro soldering stuff so ask a tech to do it for you and you'll save the price of a logic board.
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