I have a Mac 10.6.8. I am trying to connect a new XP-850 printer to it by WiFi. The printer will copy ok and scan to a USB on its own, but will not print and scan from the Mac. The Mac states it cannot communicate with the scanner and when trying to scan, the scanner doesn't allow me to connect to the computer. WiFi set up on the printer tells me a connection has been established. Download navigator states there are no updates. Any advice please?