MyBook disappeared when rebooting router

OK, never mind. I discovered I must have jostled the connection of the WD drive to the adaptor at the router when I unplugged the modem this morning. I just thought to check it, and it was loose. When I tightened it up, MyBook sprang back to life and appears to be working fine. I thought I had checked all the connections already, but I forgot about that adaptor.