Boot problem after 10.4.5 update

I installed the 10.4.5 update on my new iMac Core Duo, rebooted when it asked me to. Upon reboot now I just get the boot screen followed by a blue screen with a cursor and it just stays there. I read you can fix this by going into Safe Mode.
Anyone know the steps to fix this?
20" iMac Core Duo - 2GB Ram - 256MB VRam   Mac OS X (10.4.4)  

Did you make sure to install the Intel version of the 10.4.5 update?
Is your data backed up?

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