Ok, thanks to everyone for their replies. I really appreciate it.
Here's the latest situation:
* tried different cables and different router ports.
* did a hard reset via a paperclip in the back pinhole
* tried connecting the lan cable directly to a laptop rather than the router - It's Windows 7 Ultimate and I'm not sure if any OS config was needed to see attached devices like this.
* ran the easysearch utility and also tried the default IP address of 192.168.0.32.
* all the front lights on the device look normal.
* when connected to the router, the activity light for that port occasionally blinks.
But, it's all to no avail. There's still no connection to this device or recognition of it on the network
Would you guys agree that it's stuffed?
Also, would you agree that it would be cheaper/wiser to source a new device rather than attempt to have it repaired?
If I get a new device, will it recognise the existing RAID 1 configuration or would I need to format and start again?
Is it possible that an electrical storm may have caused this problem, given that the drives seem to spin up ok and there is occasional drive activity in the unit?
Again, many thanks for any feedback.