Situation: early 2008 MacBook Pro (4.1) running Mac OS X 10.5.8 shows Airport OFF on startup, and doesn't respond to Turn Airport ON menu bar selection. Ethernet OK. Apple Hardware test shows everything OK, but the Communications pane doesn't list an Airport MAC, only Ethernet and FireWire MACs, plus the IR module (this may be normal, but I don't know).
Question: how can I make sure that the (faulty?) Airport card is causing this behavior, and may have to be replaced, without actually replacing it?
