Ibook drops airport signal, have to reboot iBook to get AE signal back,

my powerbook is working fine and the AE light is always green, but my iBook drops the AE signal whenever it goes to sleep. upon wakeup the airport is on but no signal and I have to reboot the computer to get the signal back strong even though it's fine on the powerbook. all updates, firmware etc. done. any ideas?

You might want to try resetting the PMU. It has some control over sleep and wake issues.
Read about the nightly maintenance routines that run if a Mac running OS X is not shut down or allowed to sleep in this Apple Knowledge Base article:
http://docs.info.apple.com/article.html?artnum=107388
If you set the iBook (in Energy Saver Preferences) to just sleep the display (and leave it plugged in at night and open), these routines can run and she won't lose the AirPort signal, either.
I only close mine when I'm going to put it in its bag and take it somewhere (in that case, it would lose the AirPort signal anyway).
Maybe the PMU reset will do the trick for you and she won't have to use it the way I use mine (if she doesn't want to).

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