Have been printing wirelessly successfully up until today (last print was 2 days ago). No other changes to my network has occurred. Officejet 4635 now says off line and I have reset to factory settings and tried to connect to my WiFi and it is telling me the passcode is incorrect - but it isn't. I am using the same passcode on my laptop and it is working fine. I have entered it several times. Restarted the router and restarted the printer multiple times.
I tried via my laptop to set up wireless printing (via a USB to the printer) and it still tells me the passcode is incorrect.