Hi,
I have exactly the same problem. I tried all the advice here and I still cannot print. My computer does not even see the printer (either via direct USB plug in, if I plug the printer into my router or if I just go via wifi).
(1) I had to get a new wifi router so my network changed yesterday. However, I was always printing before directly to the printer regardless of wifi.
(2) When I download any of these programs I cannot chose where to install them. I found this weird. I had to go searching and searching to find them I only find the Canon driver. When I launch this I get "printer not detected" and then the program closes. I cannot find Gutenprint anywhere. How can find and delete this?
(3) I have done multiple restarts, checked cables etc etc. If I go to system preferences and printer settings no printer appears.
Any ideas? Need to print a lot so in a worse case I will have to buy a new printer. I have loved my Mp620 - any advice regarding the Canon Mx925? This at least has AirPrint for my iPAD.
Before investing I would like to see if this issue can be fixed.
Many thanks in advance for any tips!
Michael.