Sorry for giving incorrect information. I should have verified before posting information. Additionally, I did not give you the process to shut off services because I inferred that you wanted to edit a config file. In any event, corrections to my post are below.
1. Boot to Fedora DVD install disc
2. Type at the lilo prompt
//this procedure will mount the linux root filesystem under the /sysimage directory
3. At the root prompt, change to the file you need to edit
You will find two etc directories; make sure that you change to correct directory, i.e. located under /mnt/sysimage directory
Lastly, Seve provided you the correct details to specifically shut off any service that is hanging a system. The reason all the commands did not work was he had a typo.
chconfig --list | grep on //typo
should have been
chkconfig --list | grep on //chkconfig --list prints all the services into the grep command via a pipe | the grep command filters for only services that are on
/sbin/chkconfig nfs off //shuts the nfs service off by removing the service from the /etc/rc5.d - actually it removes any soft links from the /etc/rc5.d directory to the /etc/init.d
Hope this help!