Apache?

Go to the console and type "apachectl graceful"
Now, if Apache was running or still hanging during startup, it will be stopped.
Now type "apachectl start".
If it gives you an error OR hangs during start, type "apachectl configtest" (if it is hanging during start, stop it with "apachectl graceful" first).

The configtest will tell you if the config is wrong. If this is not the case, I recommend installing Apache again, maybe one of the modules isn't working, outdated or an update failed to do it's work right and left you with a crippled Apache install. If, however, the installation is OK, the error should turn up when apachectl configtest is executed.
 
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