Canon MP560 Communication Error has led to bigger problems

I have a MacBook Pro, running OS X 10.6, which has worked well with my Canon MP 560 for the last year or so. I have occasionally had this "Communication Error" issue but in the past pausing the printer and then turning the printer off and on again has fixed the problem.
However this time round that hasn't worked, it just continued to say "Communication Error". I came on here and I tried a number of solutions, I removed the printer from the Print and Fax section of systems preferences and then reinstalled the whole thing from the Canon website.
However now the printer isn't showing up when the setup looks for it, either on USB or wireless, and I can't add it back in on system preferences. I have reset the settings on the printer and reconnected it to the network and it seems to be successfully connected however if I ping it it fails. The blue wifi light is on.
I am at a loss....any suggestions anyone???

Given that you cannot ping the MP560 while its WiFi light shows that it is connected to the wireless network is a concern. It is also odd that you cannot see the printer when it is connected to the Mac via USB, although USB printer cables have been known to fail and cause this sort of result.
For the wireless connection, with the ping failing to get a response I would check the network settings in the MP560 and for your Mac. For most home networks, the first three sets of numbers in the IP address should match, while the last number must be different. The subnet mask and gateway/router address must also be the same. If the network settings for the printer and Mac are correct and yet you still cannot ping the MP560 IP address, then turn off the printer and disconnect the power cord for 10 minutes before turning back on again. With the power reconnected, try pinging the printer again. If this also fails then it could be that the MP560 is faulty and hence the issue you also encountered with the USB connection.

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Hi hthpggy,
To try and resolve the issue, please remove the power cord from the back of the printer and leave it out for at least 10 minutes, then plug it back in and turn it back on. If the error persists, the printer will require servicing to resolve the issue.
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I've wrestled with this off and on with this printer ever since I got it. Just checked and my signal was at 44%. Guess that could be it!... guess I'll do some relocating of the router, boost the signal or run an ethernet line. Never though the signal being that low would cause this many print errors.
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http://support.apple.com/kb/HT1341?viewlocale=en_US
10.5/10.6/10.7/10.8 instructions...
In System Preferences>Fax & Print, Right click or Control+click on the Printers list Sidebar, choose Reset Printing System.
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Hello
I have used my Canon MP560 for over a year and it worked fine while it was in use, however, I put it away for several months and now I am having issues setting it back up again.
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