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you need to reconfigure your printer and laptop to WEP but I don't recommend it as WEP is terrible and easy to crack.
connect to your router via cat 5
open internet explorer and browse to http://192.168.1.1
login with the default login is blank. pass is admin.
go to wireless and to wireless security.
change it back to WPA personal.
change the passphase for the wireless password.
use the new passphase you created and tell your printer/laptop to join your wireless network
you may want to change your wireless password too so your son won't reconfigure your router again.
do this by going to administration and change the password there.
You will need to reset the printer's wireless network adapter then reconfigure it with your new wireless network settings. On the printer's operator panel, press Setup button > Network Setup > Reset Network Adapter > hit Ok. The Wifi light will momentarily turn off then will turn on orange. Once you have that, run the Lexmark wireless setup utility on your computer to configure the printer with your new wireless network settings. Thanks.
You need to reconfigure the printer and set it up to the new wireless network. You have to reset the printer's network adapter. On the printer, press Settings > Network Setup, hit Ok > Reset Network Adapter to Factory Defaults, hit Ok. The wifi light will turn off for a few seconds, then will light up solid orange. Then reinstall the printer for wireless connection. Make sure to use the correct security encryption info, if there is. If you need more assistance, leave a comment and I'll get back to it. Thanks.
You will have to reconfigure the printer with the router and then reconfigure the PC. All routers don't have the IP address range. That might be the reason why it isnt working after changing the router. Also, if you were using the printer wirelessly, the SSID (network name) and the wireless security needs to be reconfigured to match your new router. The simplest way to achieve this would be to connect the printer hard wired to the router; uninstall the printer drivers completely from the PC; and run the setup disk again. The setup will walk you through the whole process.
Please get in touch if you need further clarifications.