I assume you’ve done the obvious, like check the ethernet port connections, change the ethernet cables, change the port on the router, etc.
Have you accessed the router’s UI to check what its network device map shows; does the MyCloud appear in the network map? (ah. the wake_on_lan check ought to give the same result).
My suspicion would be that there may have been a fault on the PSU of your original router, or lightning strike on your local power grid system (though I might expect that to have affected more electrical appliances in your home), that may have fried your router, and, in turn, your MyCloud. If you have an ADSL line, an overvoltage condition on the telephone line may have done the damage; this would not affect other electricals in your home. But anything with a telephone line connection ought to have adequate protection against such faults (barring local lightning strike, but you’d know about that because of the blackened hole where your telephone socket used to be…).
For data recovery from the disk, see this thread:
