Mac OS X booting... Won't boot

This afternoon I installed the new security update on my MacBook and restarted it as usual, but when booting again it got stuck in the phase where the screen is blue and there's the box saying: Mac OS X booting.. and the blue bar runs.
I tried to switch it off and start again but it always gets stuck on this phase. I even left it run for couple hours but nothing happened.
I found this http://discussions.apple.com/thread.jspa?messageID=8862343&#8862343 discussion on the forum even though the problem is slightly different since my MacBook gets all the way to the booting phase with the blue bar running. So anyways, I tried to boot my MacBook with the installation disk 1 and used the disk utility to verify and repair the Macintosh HD but it couldn't find anything to repair. After that I rebooted it but the same problem occured once again.
I've zeroed the PRAM memory and it didnt help either. I'm helpless and I have no idea what to do now. Could anyone please try to help me..?
I'm using Mac OS X 10.4.11 just to make sure.

So sorry I couldn't reply--I had to leave for class shortly after I posted here.
Yes, you could have used your iPod as a temporary storage spot, but moving your data there would have required a working computer.
Good to hear you got things working--and thanks for the star! If you need more help, come back
~Lyssa

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