What should I verify if my wireless printer cannot connect to the network?

Verify that no network cable is connected (the printer cannot connect wirelessly when a cable is connected), that the printer and wireless router are powered on with the wireless switch enabled, that the printer is within 30 m (100 ft) of the wireless access point, that the print driver is installed, that both devices connect to the same network, and for Mac, that the router supports Bonjour.