I was having some troubles with the starting up of my linux box. Now these problems are solved or at least I hope so :-). The problem seemed to lie with
haldaemon or messagebus.
After reading a bug description for my problem on bugzilla, I had the solution. (see the
bugzilla bug page for bug : 444410).
The priorities of some services in runlevel 5 had to be corrected.
this can be performed using:
$ /sbin/chkconfig --level 5 resetpriorities
with
being the service's name, e.g NetworkManager, messagebus, ...