My new imac (OS 10.11.1) will not print wirelessly unless the laptop that has the original Cannon software installed is open and turned on. My imac can find the printer and it is set as the default printer. I tried installing the software from a CD Rom and it failed. My imac seems to be sending my print cue to the laptop which in turn sends it to the printer. I've tried everything. I have MX870
Try downloading the latest drivers and software for the printer. Visit www.usa.canon.com and search for your printer to access the downloads.
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