I have a macbook pro 10.5.8 version and an HP wireless printer 4500 series. They worked great together until I got a CISCO router. Now I can only print with the USB cord attached. I am not a tech person AT ALL so I do not know how to begin to fix this. I tried to delete the printer and let it search for the printer again, but no printer would show up until I plugged it back in. I went to the screen to add the printer IP and when I filled in the number that I thought was the printer IP address, it did not find anything. Any suggestions? Today I deleted the printer and went to the HP site and downloaded the driver and reinstalled it. During the installation it asked me to connect it with the USB cable. It also said it had successfully connected wirelessly. Once I unplugged the USB cable it said the printer was offline and didn't work.