20 Most Recent Cisco Photosmart C4780 Wireless AllInOne Printer With Linksys By Cisco WirelessN Broadband Router Questions & Answers

There could be something stuck inside. Look inside and inspect to make sure there's no paper or anything else clogging in

Try hard-wiring your laptop to the router with an ethernet cable as a test and then try printing, if you do not loose connection to the internet then the problem is probably that the printing is hogging your wireless bandwidth.If the same thing happens with loosing connection to the internet try connecting to the internet real quick through another computer that is hardwired, you want to find out if the problem is a wireless one or that affects wired computers also. You might need a driver upgrade, you also might need to upgrade the firmware of the router

login into the router and add the printer mac address to your mac address filter table