I have a "Mid-2005" iBook 1.33; 12"; 10.4.7 I have been troubleshooting my iBook to find out why the Airport signal drops out intermittently and then comes back at full strength. My wife has an identical model with identical settings in the same location and does not experience this problem. After trashing prefs, repairing permissions, zapping PRAM, resetting the PMU, safe boot, connecting with Ethernet cable, etc., etc., I have finally come up with a theory and I want to know if it's possible. In this model, the airport card and antenna are built-in; they are not user accessible. The only pattern seems to be that after working for a while the wireless signal suddenly drops. Is it possible that when the laptop heats up after a little use, something expands or contracts and touches something else and thereby neutralizes the airport card?