MacBook Pro not booting up after Software Update ('prohibited' symbol)

Hi there
I'm having some issues with my (late 2008) MacBook Pro after installing a recent software update: the machine is not booting up, instead displaying the 'prohibited' symbol on the grey bootup screen, thus:
!http://img828.imageshack.us/img828/7215/photovl.jpg!
The back story: this morning I ran Software Update and installed the iWork update, the latest security update and the Snow Leopard Graphics Update. This installation apparently went fine, however on the required reboot the computer displayed the above image, and did nothing.
I booted from the Snow Leopard install DVD, fixed disk permissions and repaired the disc, which Disk Utility claimed was successful; the computer still would not boot.
I then rebooted from the Snow Leopard DVD and restored from my most recent Time Machine backup (dated a few days ago, before the software update). This, still, did not do the trick.
As I have never seen this particular issue before, I'm at a loss as to what to try next, partly as I don't really know what the symbol is signifying. Any assistance that can be offered would be very, very useful.
Cheers in advance!

Thanks for that, I did go looking for it but couldn't find it.
Unfortunately, resetting the PRAM and NVRAM didn't work. Will a reinstallation of OS X make a difference, bearing in mind I've already restored from a Time Machine backup? (I don't know if those clone everything or don't include system files).

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Delete items on target that aren't on the source: No
18:23:39 Enabling ownership on the target volume...
18:23:50 The target volume has ownership enabled.
18:23:50 The target volume has Access Control Lists enabled.
18:23:50 Authenticating...
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18:31:20 rsync: readdir("/Applications/Utilities/Audio MIDI Setup.app/Contents/Resources/French.lproj"): Input/output error (5)
19:04:41 rsync: readdir("/System/Library/Components/AudioCodecs.component/Contents/Resources/Fr ench.lproj"): Input/output error (5)
19:05:41 rsync: readdir("/System/Library/CoreServices/Menu Extras/IrDA.menu/Contents/Resources/French.lproj"): Input/output error (5)
19:06:01 rsync: readdir("/System/Library/CoreServices/Menu Extras/User.menu/Contents/Resources/French.lproj"): Input/output error (5)
19:07:05 rsync: readdir("/System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBC DCECMData.kext/Contents/Resources/French.lproj"): Input/output error (5)
19:10:13 rsync: readdir("/System/Library/PrivateFrameworks/Assistant.framework/Versions/A/Resou rces/French.lproj"): Input/output error (5)
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19:50:11 rsync: Some errors were encountered during the backup., Error code: 51
19:50:14 Sync Engine warnings: (
"rsync: readdir(\"/Applications/Utilities/Audio MIDI Setup.app/Contents/Resources/French.lproj\"): Input/output error (5)",
"rsync: readdir(\"/System/Library/Components/AudioCodecs.component/Contents/Resources/F rench.lproj\"): Input/output error (5)",
"rsync: readdir(\"/System/Library/CoreServices/Menu Extras/IrDA.menu/Contents/Resources/French.lproj\"): Input/output error (5)",
"rsync: readdir(\"/System/Library/CoreServices/Menu Extras/User.menu/Contents/Resources/French.lproj\"): Input/output error (5)",
"rsync: readdir(\"/System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSB CDCECMData.kext/Contents/Resources/French.lproj\"): Input/output error (5)",
"rsync: readdir(\"/System/Library/PrivateFrameworks/Assistant.framework/Versions/A/Reso urces/French.lproj\"): Input/output error (5)",
"rsync error: some files/attrs were not transferred (see previous errors) (code 23) at /Volumes/Home/Users/bombich/Development/Bombich_Software/rsync-3.0.5pre2/main.c (1047) [sender=3.0.5pre2]"
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2009-03-01 10:30:14 +0100
2009-03-01 10:30:21.962 SystemUIServer[213] lang is:en
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Mar 1 11:38:25 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Mar 1 12:46:40 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Mar 1 13:54:55 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Mar 1 15:03:13 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Mar 1 16:11:31 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Mar 1 17:19:46 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Main starting
2009-03-01 17:47:20.393 Skype[313] SkypeApplication::init called
2009-03-01 17:47:21.554 Skype[313] SKInitDebugLogging
2009-03-01 17:47:46.169 Skype[313] SkypeSound::setAudioDeviceUID: cannot find audio device with UID (null), trying to use default system output device instead
2009-03-01 17:47:47.208 Skype[313] SkypeSound::setAudioDeviceUID: cannot find audio device with UID (null), trying to use default system output device instead
Starting the process...
2009-03-01 17:48:36.186 Skype[313] MacVideo getDimensions rc == NO, width 0, height 0
2009-03-01 17:48:36.367 Skype[313] MacVideo getDimensions rc == NO, width 0, height 0
2009-03-01 17:48:37.367 Skype[313] MacVideo getDimensions rc == NO, width 0, height 0
2009-03-01 17:48:37.369 Skype[313] MacVideo getDimensions rc == NO, width 0, height 0
2009-03-01 17:59:16.450 Skype[313] SkypeSound::setAudioDeviceUID: cannot find audio device with UID (null), trying to use default system output device instead
Mar 1 17:59:19 Bs-Home-Mac crashdump[355]: Skype crashed
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2009-03-01 18:41:12.433 Skype[393] SKInitDebugLogging
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Mar 1 19:57:12 Bs-Home-Mac mdimportserver[480]: * +[NSUnarchiver unarchiveObjectWithData:]: extra data discarded
Mar 1 20:44:34 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Mar 1 21:52:51 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor
Mar 1 23:01:07 Bs-Home-Mac ntpd[191]: sendto(17.72.255.12): Bad file descriptor"
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