Network Printers fallen off the network

Hey all Major Geeks,

I have a unique problem. After a weekend away from the office all the network printers stopped working for everyone in the office (we did have some big thunderstorms and a few outages but we have them plugged into a battery backup / surge protector).

Here is my question:

None of the printers could be seen on the wireless network, when I plugged my laptop into the network I could see the printers fine (still could not print though)..I reinstalled the printers while wired to the network and could print fine. As soon as I unplug the printers they disappear.

Any idea why this is happening?

The router works for wireless Internet and the Printers are set to static IP's and when I go into the Network setup on the printers, everything looks good.

Topology is as follows:

Cable Modem -> Wireless Router...
Wireless Router -> Dell 2355 Network Printer & Samsung CLP Printer
Wireless Router -> Unmanaged Switch -> 5 Laptops

Any insight would be GREATLY appreciated!

Thanks,
Robb