HT5167 I've run the update, agreed to the restart and now my MacBook won't restart ***?

First time this has happened to me after many years, but this software update has borked my machine. Looks like it had auto-downloaded, so I agreed to restart and on the restart sat there on grey screen with Apple logo and the spinning gear.  After several hours decided something had gone wrong, powered down and have tried without success to get her back to life. Safe mode is reporting 'runtime corruptions', 'socket not connected', 'invlid laf record count', 'Rebuilding catalog B-tree' etc etc. Not good. Any thoughts on how to dignose what's going on without having to refer to an Apple store?

There are several ways to back up a Mac that is unable to fully boot. You need an external hard drive to hold the backup data.
1. Boot from your recovery partition (10.7 or later), a local Time Machine backup volume (10.7.2 or later), or your installation disc (10.6.8 or earlier.) Launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”
How to back up and restore your files
2. If you have a working Mac, and both it and the non-working Mac have FireWire ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive.
How to use and troubleshoot FireWire target disk mode
3. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.

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