Posted 14 April 2009 - 03:19 PM
Have you tried simply rebooting the routher?
If not try that first, pull the power cord out of the back of it, wait a second or two and then plug it back in.
The router should reassign all the computers an address again.
Also if you're not already you may want to consider using static addressing on your LAN, that way each device, most importantly the computer that printer is connected to, uses the same IP address every time.
Keep in mind at the same time its not really necessary to use static addressing for all the computers if you do not wish to, but would likely find it works much better by doing so with that one computer acting as a print server.