Hp printer suddenly giving error message when connected to wireless router

I bought a hp photosmart 5520 printer 2 months ago for light duty printing. It worked fine initially but last week when I switched it on, an error message flashed up and then the display went white with a message to turn printer off and on. Turning it off and on again doesn't help. If I switch off the wireless router, the printer works fine to connect to manually. However, as soon as the router is switched back on, the error message comes back up. I've tried resetting the router but it hasn't helped. I can't adjust the connection settings on the printer as it goes into the error message mode as soon as it establishes a connection with the router. I'm tearing my hair out and on the verge of bringing the printer back to argos and launching it over the counter. Argh!