one site on server won't resolve-- how to troubleshoot?

I've got one website on the server that formerly worked but no longer does. I'm not sure when this started.

Trying to ping the site doesn't work ("ping request could not find host")

a dig command on the server results in the following: (instances of the domain in question are replaced with domain.com)

Code:

root@snowwhite [~]# dig @localhost domain.com

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-20.P1.el5_8.6 <<>> @localhost domain.com
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 54795
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;domain.com.         IN      A

;; AUTHORITY SECTION:
com.                    900     IN      SOA     a.gtld-servers.net. nstld.verisign-grs.com. 1400443331 1800 900 604800 86400

;; Query time: 100 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun May 18 15:02:34 2014
;; MSG SIZE  rcvd: 112

 

domain is not expired and is pointed to the correct nameservers (the same nameservers other sites on the server point to and function fine)

 

i deleted and remade it and there was no change. intodns says the following: Can't get nameservers at parent server!<br>I only check domains not subdomains!