Setup services to run on bootup
The Redhat command:
Hold the Alt key down, press F2
In the run dialog box that "should" popup type:
It will ask for your root password.
Find vnc (or whatever service you want)
Make sure it is set to start.
There are three "run levels" to worry about:3,4,5
Level 3 is before a graphical interface starts (Set VNC to run here on 3 and on level 4, 5)
Hope this helps.