USB connectivity suddenly partly gone

For the last two days, for no apparent reason, I've lost USB connectivity to my digital camera, printer and USB memory stick. The keyboard and mouse are fine thankfully, so I can still work.
I'm a pretty seasoned Mac compaigner so I've checked all the usual stuff.
(1) Yes, all the missing peripherals show up under the System Profiler, so the USB ports aren't blown.
(2) This is on a G5 and the front USB port won't show the USB stick, nor will EITHER rear USB port allow the powered hub to run the printer. The same hub has a Bluetooth dongle in it which still does work.
(3) Switching the keyboard and mouse around to the other rear USB port takes the problem with it: That is, the keyboard and mouse work in the port that was not working with the powered hub and the powered hub won't work in the port in which the keyboard and mouse just worked,
(4) I've completely removed the powered hub and stuck the printer directly into the (now available) port on the back and the printer still won't work.
I don't know what else to do. There's no consistency here. Both rear USB ports work in certain circumstances.
Thanks.

"The problems appear to have gone, so thanks heaps for making me take another look at Onyx.
Problem solved!! "
Hi Michael, Welcome back to the Forums.
In your exuberance* you neglected you show your thank you to Ian via the star system. See Terms of Use or bottom of Apple email alerts to you.
* That's the usual reason. Typical response = "Sorry bout that. Here you go."
Glad it was that simple. Joyous Computing. JP

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As it has allways functioned perfectly for me I don´t know what to do. It was about that time I uppdated the Java pack resently submitted by Apple. But I can´t see why this should have aything to do with this.
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Problem with the USB-connection after upgrade to P...

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USB connectivity suddenly partly gone

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