SIST error message

I got a text about an outage during some storms yesterday.  Came home and the cable was working some, but saved programs weren't accessible.  The power had gone off for a brief moment before I got home from work.  Got a text then that the outage had been resolved.  The power blinked again and after that neither dvr boxes worked, kept giving me connection errors and to check that my cables were tightened and whatnot.  So I currently have no cable service and the first a tech can get out is a couple days.   I even replaced my splitter thinking maybe the power blips fried that.  Nope.  And there's no way both boxes were damaged at the same time I don't think.  Went outside and the line coming into the house looks intact, as does it look like it's still connected to the main line behind the house.  Any ideas what the issue could be?