Cannot connect printer to iMac using USB - Help!

We have just bought a new Canon pixma pro 9500 mark II printer & it just will not show up in the print & fax preferences or add printer dialog boxes. I am running OS X v10.6 & have just completely erased the hard drive & started from scratch after numerous upgrades of printer drivers & updates for Mac OS X. I am now running the latest 10.6.8 after installing the MacOSXUpdCombo10.6.8.dmg v 1.1 & also I have installed the latest canon printer drivers but still nothing. I don't know what else I can do, the printer works off a pc using the same usb cable & even connects to an old macbook pro. Also the old macbook pro had a generic printer in the preferences whereas this iMac has nothing, which makes me think its a mac problem, I have attached a screenshot to show how the printers are installed in the Library but nothing is showing up in the preferences.
Also i have contacted Canon & they were no help at all. If anyone can help I'd really appreciate it!
Thanks

You tried clicking the ⊞ Add button in the Print and Fax Preference...?
If so and your still getting nothing, then perhaps your USB port overload protection is tripped. Try testing another USB device on that port or try the printer on a different port.
If you find that some or all of your USB ports are not working,
Reset the SMC, as per > Resetting the System Management Controller
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
Then reconnect the Printer and try again.

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