Site down, but just www version of domain

Hi:
One of our sites is down, though strangely, only the www version. For example:

http://mydomain.com (works)
http://www.mydomain.com (doesn't work)

I tried restarting apache, though it didn't help. Does anyone have any advise? My web host is out for the day, so I can't get any help from them until tomorrow.

Thanks,

 

 

 

 

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