My iMac does not boot after update!!!

I have just update my iMac (Intel) with Apple Software update. I have not updated for quite a while and obvious there were a bunch of stuff to update on my mac. However, when the computer requests a restart, my computer simply does not restart at all. I have tried to make it restart from the apple icon, and it still stay on. So I turn it off manually and the problem kicks in. My computer start with the grey apple icon screen and the little progress indicator, but it does not boot into OS X!!! It remains in a blue screen with the mouse pointer.
I restarted it again unplugging everying and nothing changed. Then I tried Disk Repair and it does not help neither. Then I tried to hold the power button while turning it on till I get the loud beep noise and flashy light. The problem stay the same. I do not want to erase my disk...
Someone Helps!
Intel iMac 20" Dual Core / MacBook Pro 15" Mac OS X (10.4.6)

Interesting. Have you installed any third-party RAM? Is there any possibility that your RAM became loose? Make sure your existing RAM is seated properly.
Have you performed a SMC reset?
Resetting the SMC can resolve some computer issues such as not starting up:
From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
Unplug all cables from the computer, including the power cord and any display cables.
Wait at least 15 seconds.
Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer.
Press the power button on the back to start up your computer.
Are you able to boot in SAFE mode? If so, you can trouble shoot from there.
Be sure the computer is shut down.
Press the power button.
Immediately after you hear the startup tone, press and hold the Shift key.
Tip: The Shift key should be held as soon as possible after the startup tone but not before.
Release the Shift key when you see the gray Apple and progress indicator (looks like a spinning gear).

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