Originally Posted by lmn
I installed Fedora 10 in text mode. Then I logged in as root and modified inittab to switch to GUI mode.
Sometimes logging in as root in runlevel 3 is enough to stop Firstboot (what you probably mean by "Setup Agent", I guess) from happening when you change the runlevel to 5. It's happened to me before anyway.
After you have booted in rescue mode like SlowJet suggested, try resetting the Firstboot to occur by doing these...
chkconfig firstboot on
You can leave the runlevel at 5, and just reboot. I think you will then get the Firstboot screens where you create a user account and configure a few things.