Problem to start iMac after 10.4.11 update please help

Hi Everyone
My iMac suddenly unprovoked not working after I downloaded the latest OS X 10.4.11 update from apple.com.
After downloaded successfully, I double clicked the file to update, but nothing happened, the computer seemed not respond anything, so I logged out, but still not responding. I waited for almost 30 minutes I force switched off iMac by holding down the switch button.
Then I tried to switch it back on that normally iMac would run fine, but it stuck again remained as the starting screen, a white background with an Apple logo in the middle and a circle spinning displays loading, but wait forever and nothing happens.
How can I start my Mac as I am a new user of Macs? Is there another way?
Thanks.

Hi
Just in case you are in the same situation & haven't already wiped your files then read this:
I was pointed in this direction (see link below) when the same thing happened to me & I have managed to retreive all of my data using another mac that has OS X & a firewire cable.
http://discussions.apple.com/thread.jspa?threadID=1246278&tstart=0
Here is some more info as well here from me to try to help to explain things as at first I couldn't make head nor tail of what I was supposed to do:
Make sure the mac that works is switched on & that your mac that will not start up properly is switched off. Connect the 2 computers using a firewire cable & then switch the mac that will not start up properly on while holding the 't' key down.
After a while a symbol will bounce around on your mac & the mac that works ok that you are connected to should show your hard disk on it's desktop (a bit like when you plug a camera or a phone or an i-pod in). The you can retrieve what you need to save off your hard disk (by dragging it onto the computer that works) & back it up. This may take some time but at least you will have waht you need
Then AND ONLY ONCE YOUR DATA IS SAFE you can erase & re-install your system software.
To do this you should eject your hard drive from the computer you are using to rescue your data (i.e. like when you eject a cd/phone/i-pod etc.)
Then you can restart your mac (the one that has frozen) and then immediately put your mac OS X installation dvd (the one that came when you got your mac) press c while it starts and then say install. You will need to also go to options & click erase & install. This will format your computer & erase everything off it so like I said make sure your data is safe first on another computer or even better onto disk.
I hope this is as helpful as I found it when I was told the same information earlier...
Jazamin

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