IMac won't recognize printer but powermac will

I have been using a canon 1860 printer for a long time with no problems. Today my electricity went off. I shut down and then restarted plugged into an extension cord, so the printer was not on or connected. When the power came back on and I plugged everything back in, the printer had (virtually) disappeared.
When I connect it to my Powermac it works fine and I can use it with the iMac via the network, but I am worried that the iMac's inability to recognize the printer suddenly is an indication of a more serious problem.
I repaired permissions and downloaded a fresh copy of the driver but that did nothing.

Unbelievable. The antenna wasn't plugged in all the way on the Airport card. And to think I spent about 3 hours trying to resolve this. Well, thanks for your post, otherwise I'd still be screwing around. And lesson learned.

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