IMac 24" does not boot up after Installing 10.6

Hi,
Last night i did the upgrade, well i put the dvd and clicked install, it rebooted, install everything.
Then i saw the screen saying that the install was completed (hope it meant: upgrade!!!).
But then, i just see the white background a the little circle running... after 1 hour same thing... So i shut it down, and restart, same thing ?
What is going on ? The installation manual was not clear about performing an update !
Any idea how i can fix this ?

I was able to eject the dvd by pressing the usb mouse left button while booting. Then put it back in after a reboot
After that selecting the alt-key, i selected the install dvd, and after a while (gray background and spinning weel) it took me again to the installation screen.
Will tell you if it is working in a while...

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N5K-C5596T                                                 1.1                                         1.2
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