Since installing lion my iMac and powebook can't find my printer

since installing lion my iMac and macbook pro can't find my printer (it is on the supported devices list and I downloaded the latest drivers).
I called canon and they stepped me through reseting my print system and reinstalling the print drivers and libraries but I have tried direct USB and via airport and the computers dont recognise the printer anymore. Just to be sure it was not the printer I tried to print from my iphone and that works...
I have changed the usb cable, changed usb ports and nothing can get the computers to recognise the device. Please help all advice welcome!

:-) here's an interesting link http://support.apple.com/kb/HT3669#canon
Note: If you've haven't used Software Update recently on your Mac, please run it before connecting a printer or scanner to update your Mac's database on what software is available.
I would also do this after you plug in your printer. Apple might have updates for your printer.
there is Canon Software for lion. try uninstalling everything and starting from 0.
http://www.usa.canon.com/cusa/consumer/products/printers_multifunction/office_al l_in_one_inkjet_printers/pixma_mx860#DriversAndSoftware
I also read that if your printer shows up in your printer list before the appropriate drivers are installed, it might mess things up, if you plug in your printer and see it after cleaning everything you had done previously off, then try removing it from the printer list (don't just unplug it, delete the profile). And then install the appropriate drivers.

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