IMac no longer sees Canon MP520

I have had a Canon MP 520 connected by USB to my iMac for over a year. I have recently added an Airport Extreme wireless network to our home and have plugged in a HP 6500 printer that works on the network. Now my computer does not recognize the Canon printer and I have even reloaded the software. I can print just fine to the HP printer but when I go to Fusion to use some of my old Windows programs, Excel, I can't print to the HP and it can't find the Canon either. I have unplugged the printer, turned it on and off, restarted the computer, and unplugged the USB cord. Nothing seems to make any effect and I still can't print to the Canon printer. Any suggestions?

Thnx for the reply. Reading your original posting I assumed you meant that the MP520 is still connected to the iMac via USB - rather than to the USB port of the Airport Extreme. Hence my statement about checking the USB port entry in System Profiler. If the MP520 is connected to the USB port of the iMac but not shown in the USB bus list, then this would suggest that either the USB cable is faulty or the USB input on the MP520 has stopped working. If you have another USB printer cable then I would replace it now and check the System Profiler > Hardware > USB entry again. If the MP520 still fails to appear then the printer is most likely faulty.
As for the HP, if it is connected to the USB port of the Airport, then it would be advertised as a Bonjour device. In a normal Windows setup, such as Boot Camp, then you would need an application like Bonjour for Windows to find the printer connected to the Airport. I'm not too sure how Fusion would see the printer in this setup. When running my Boot Camp XP via Fusion, which is set to NAT for networks, I print directly to network printers that are installed on XP, as opposed to the Mac printers. So I will do some testing here at home and reply later.
PaHu

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