Apologies I haven't used Fedora in some time so I have forgotten some of the basics.
When I boot up, my system (F16) it hangs at a certain point (see attached image). It was there for 5 minutes before I pressed ctrl-alt-del and it started the shutdown process. This leads me to believe there is something going wrong with a service.
Unfortunately I notice that /var/log/boot.log is empty so I can't provide that.
What I probably should mention is that I updated this from f15. while there are still some f15 files leftover, they don't strike me as being critical system files during startup - http://pastebin.com/FvQNts5Z