Freezing on boot at Apple Screen

I was just performing the latest OSX 10.6 update on my system when it lost power midway through the update. Now, when I turn it on, it gets to the grey Apple screen and the swirly thing stops swirling. The boot is never completed. It just sits there.
Ideas?

Your power loss was probably at a critical point in the update which has caused your system to be unbootable now. I suggest you install the system again from your install DVD for that Mac.
|___________________
Allan

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