dead; need help reconnecting

weds morning at 4 was my last log so it was around  then that my telco modem broke.  a few       hours ago a  tech reset     the
router with all 5 ips.  my bsd server is dead/water.  only my wifes pc and daughters nmacbook work.   i have spent hours under desk trying one thing/time.
 
does anyone have any suuggestions what  to try next?     i have only bsd server;  ubuntu desktop.   standalone firewall.  one hub/switgh.
 
gary
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