Loss of signal after restart following QT upgrade

On restart after downloading and installing QT 7.1.1, I lose the wireless signal. Is it just coincidence? I've tried to use the Airport Assistant but it hangs when it tries to join the network. I've also tried to connect the ethernet cable from the Airport Express station to my powerbook and update the firmware from 6.2 to 6.3 but the updater hangs every time.
I am now connecting directly to the ADSL router by E'net cable and I don't know what to try next or what to make of it?
Thanks for any advice. I would very much like to get back to wireless.
PB G4 Mac OS X (10.3.9)

Yes, alternate universe appears to be the most logical explanation. After months of no signal at all on the iMac, but great signal on the four other wireless connections, suddenly with no other changes or adjustments, simply doing a QuickTime update, causes the signal to re-appear during the update, to remain during multple reboots - even after rebooting in OS 9.2.2, and then rebooting again in OSX.4.6 the signal is still great - and even after five days the signal is still great - no signal fluctuating over the past five days (that had been a common phenomena before) - no signal drop offs during the past 5 days (that also had been a common phenomena). What? was it one of those wild coincidences, that at the precise moment that I was doing the QuickTime update, that actually an hideous, undetected RF Interference source chose that exact instant to stop interferring and to remain non-interferring until this present moment (doubtful) - or was it somehow related to software or to the update process? (I realize that this is not an attractive hypothesis, but is it remotely possible? - Of course, if it is in someway, that Apple wouldn't come out and say as much - not prudent -, but would attempt to correct it in a subsequent update)
---- So Gino, re-enter the real universe, don't speak these things, but be quiet and simply be satisfied that you have a good signal again - you'd be better off not even remembering that these other things even happened.

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Has any one else had this problem?
I had a very strong 3G signal before I upgraded to 4.0.2. Now I only have storng Edge signal or strong GPRS signal. I have phoned O2 and they have told me that there is no problem with their Network. On the advice of the O2 customer services I took the sim card out and reinstalled, still no change in signal.
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Yes, alternate universe appears to be the most logical explanation. After months of no signal at all on the iMac, but great signal on the four other wireless connections, suddenly with no other changes or adjustments, simply doing a QuickTime update, causes the signal to re-appear during the update, to remain during multple reboots - even after rebooting in OS 9.2.2, and then rebooting again in OSX.4.6 the signal is still great - and even after five days the signal is still great - no signal fluctuating over the past five days (that had been a common phenomena before) - no signal drop offs during the past 5 days (that also had been a common phenomena). What? was it one of those wild coincidences, that at the precise moment that I was doing the QuickTime update, that actually an hideous, undetected RF Interference source chose that exact instant to stop interferring and to remain non-interferring until this present moment (doubtful) - or was it somehow related to software or to the update process? (I realize that this is not an attractive hypothesis, but is it remotely possible? - Of course, if it is in someway, that Apple wouldn't come out and say as much - not prudent -, but would attempt to correct it in a subsequent update)
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Loss of signal after restart following QT upgrade

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