Apache not dipslaying .shtml pages

Apparently we are having an issue with http this morning. 
It is running on 
a 9406-170, shuts down and starts up ok, but when you
attempt to use a 
browswer and access any of the shtml pages it generates an
internal server 
error - although NOTHING ever gets logged to the error log. 

The server is up and running no other issues have
surfaced...... 

There have been absolutely no changes on this for months
now. 

Suggestions or ideas?
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