Canon MG6100 wont print and displays "A
Have you tried a "wired" connection to a different computer?
If the problem persists, then the printer itself is the problem.
Have you tried a "wireless" connection from a different computer?
This presumes that the wireless-configuration on the printer is correct,
and that the printer is "talking" to your wireless router.
Login to the router's web-interface, and check the status of all "wireless" connections,
to ensure that the printer has a valid wireless connection to the router.
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