If the "toasted" modem was connected by ethernet, it is possible that the network adapter was also damaged by the power surge. This wouldn't necessarily show up in Device Manager if the adpater was properly installed with the correct drivers.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.