Windows 7: cannon mp620 printer

My parents have this cannon mp620 wireless printer....It's been installed and working for awhile now....not sure how long. yesterday they printed from there laptop wirelessly and today they can't. They get error: printer not responding. This was the same thing that happened to there HP wireless printer. With that one I uninstalled and reinstalled a bunch of times to end up having the same error. Now the cannon is doing the same thing. What could be the root cause of this and how can I fix this?

It can be that the printer IP address is changing, and the change is not reflected in the printer port properties in the computer's printer properties. This can happen if the printer and computers are turned off overnight. The next day, when restarting the computers and printer, the router generates new IP addresses for each that are different from those assigned the previous day. The printer is now on a different IP address than expected from its port setting.

The easiest way to get around this problem is to set the printer IP address as static in the router. First, open the printer's properties in Devices and Printers Control panel, check the Ports tab, scroll down to the printer's port, select Configure Port and write down the current Printer IP Address. Then check the bottom or back panels of the printer for the Printer's MAC address and write this down.

Then, open the router's web setup page (192.168.X.Y - typed into the address bar of your browser - where X and Y are the octets for your router). Find the method of setting a Static IP address for a given MAC Address and enter the MAC address for the printer and its current IP Address that you found above. Be sure to save these settings.

You should be good to go.

Thanks, I'll give this a try next time I go over to my parents house.

Any results to report?