IMac Intel - After installing 10.6.5 imac freezes on startup

I installed 10.6.5 on my intel imac over the weekend and after a couple of uses my imac will no longer boot.
It gets to the gray screen with the loading spinner and after a few seconds the spinner freezes.
I've tried booting into safe mode. After the progress bar disappears the gray screen and spinner appears after a few more seconds the spinner freezes again.
I've reset the p-ram multiple times.
There is a cd in the drive which I can't remove. I tried booting into Open Firmware using Command-Option-O-F; but even that boot freezes.
Any ideas?

You can try getting the CD out by holding down the eject button while booting, if you can get the CD out then you can boot try booting from the Install Disc that came with the Mac. If you can't get is ejected you will probably need to take it in for service at an AASP.
I'm assuming you haven't been using a bootable clone like SuperDuper or Carbon Copy Cloner on an external HD. If you have then you could boot from that.
Roger

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