OS X Keeps hanging at shut down.

[Shawn]

When I try to shut down OS X it closes out of everything to the point where all that is left is the desktop wallpaper, then it just hangs and doesn't continue to shut down. Is there anyway I can tell what is causing it to hang? Does it keep logs or something?

 

[n0cmonkey]

Yeah, there are logs. I think the console application can display them. If not, they may be in /var/log.

 

[Shawn]

hmm, this is pretty much all it says

Apr 12 10:50:20 shawns-powermacg3series shutdown: halt by shawn:
Apr 12 10:50:21 shawns-powermacg3series SystemStarter[288]: authentication service (302) did not complete successfully