HT1758 Power failure in the middle of a software update and not the computer will not boot up.  The computer just has a white screen with a grey apple and just loads non stop.

My iMac will not boot up after a software update.  the screen is all whute will show a grey apple in the middle and will look like it is working but nothing happens; this can go on forever.
Does anyone have any suggestions?

Do you have a backup in the form of a bootable clone or Time Machine? Restore that and then try the update again.
Some things to try here (Safe Boot)
Another option might be to download the standalone from Apple Downloads on another Mac and try installing it in Firewire Target Disk Mode to the Mac that was interrupted during the update.

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