MyBookWorld not seen by router

I have a white light MyBookWorld 2TB. I recently switched broadband to Sky and have new router. My MBW is directly plugged in to the router. After reading advice on the web I switched the MBW to a static IP address. THis process did not complete on the MBW. It is now not seen by the router. I’ve tried entering the static IP address and MAC address into the router but it’s still invisible.  Tried rebooting the MBW but am now at a loss.  Am trying to access from an iMac.Any advice would be very gratefully received.

Hello and welcome, try pressing the reset button on the back for 4 seconds, this will return the configuration of the My Book back to default, but it wont delete any files.