Make sure you have installed the router properly.

We changed our a few months back and all of the IPs changed, once we fixed that, they worked properly again

Another tip that might save you time in the future is to buy some liquid paper to mark which wire goes in to which port on the router, we have 5 machines plus 2 printers connected to ours and it really is a time saver :thumbsup:

Regards,

Lee