Software Update: Stuck on White Apple Screen

Hi, I hope someone could help me fix this.
I ran software update and got (iPhoto, itunes, Security patch) so I ran it and downloaded everything except the Intel Security Patch. So I restarted and decided to try again.
Restart didn't work as it got stuck and I had to reach around and restart by holding down the power button.
When it came back up, I got the white screen with the grey apple logo and the spinning clock like icon..... spinning and that is where I am stuck, left it off all night and tried it in the morning, same thing.
I would try to start up from the OSX disk except I have a DVD in the machine.
I am thinking it was that security update that didn't download fully that is doing this but how do I get the imac, "unstuck"? or how do I manually eject that DVD to put in a OSX start up disk?
flustered.
thanks.

Hi flashboy131,
I had this exact problem a couple of weeks ago - I think the problem was that the software update attempted to do the 10.4.7 Combo update (I was 10.4.5 at the time) at the same time as a firmware update (to 1.1f5). Did you do these simultaneously as well?
Anyway, after a number of days of messing around with disk utility, safe boot etc... I discovered a load of corrupt startup items which when resolved allowed me to boot into the OS, but even after that a couple of frameworks were corrupt/missing and caused many applications to crash. Tried to fix it for a while but ended up cutting my losses and doing an archive and install, followed by 'careful' software updating - you learn the hard way I suppose!
Don't mean to be negative - your problem may be easily sorted but this was my experience. As a first step, boot into your OS X DVD, open disk utility and repair disk and permissions. If this doesn't work try to isolate your startup items.
Let us know how you get on

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    Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
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