Laptop won't start after cutting out during an update

Dear All,
My laptop cut out during a software update (I think the battery died, although the screen readout said I had plenty of life left) and since then it won't start up. When I turn it on it just goes to the grey screen with the apple logo and the little circular symbol showing that it's thinking about something, the one that normally comes up before the sign-in box appears.
I have attempted to start from my OS X installer disc 1, but after a lot of noisey chugging, nothing further happened (except that my disc is now stuck in the drive).
Any help would be greatly appreciated.

Hannah.singh: Both the Repair Disk routine in Disk Utility and the fsck routine that you've now run check the structure of the file system on your hard drive. In essence, they're checking to see that every item listed in the disk's invisible directory is actually where the directory says it is. Neither utility can or will alert you if a necessary file has gone missing (because, for example, an updater has deleted it and not replaced it with a new version), or if an incomplete update has left incompatible system files in place that will prevent the computer from starting up, or keep some other essential operation from being performed. These utilities aren't designed to discover whether there is actually a bootable operating system in place; they only tell you whether the disk directory matches the actual contents of the disk, and if not, whether they've been able to patch it so the two do match.
So if you were applying an update that altered any system files before it was interrupted, it's possible that the operating system on your computer is now unusable even though the directory is in fine shape and all the hardware checks out too.
Under the circumstances, I recommend starting up from your latest OS X installer CD/DVD and performing an Archive & Install.

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Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
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Attachments:
Capture48.JPG ‏136 KB

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Laptop won't start after cutting out during an update

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