Reaching blue screen on start up - login window not appearing

I've checked the other threads on this, and have even posted about this previously without solution. The last time this happened I had no choice but to clone over my backup. Now it's happened again I need to stop it from happening a third time.
We've had two instances of my partner shutting down from within her user and finding the Mac hanging for so long that she's forced to hold the power button down to get out of it. The next day I run DiskWarrior, restart and all appears fine - no problem restarting or on shutdown. This morning I get to the blue screen and that's where it stays. The mouse appears, then disappears, then appears again, and this is all it does.
Started up in Safe Mode - same result.
Ran DW and TTP4 again - no issues and nothing to repair.
Every test I run shows everything is as it should be - yet all I get is blue screen.
The Crash Log shows an issue with the Security Agent. If anyone can interpret it and shed some light I'd be really grateful:
Process: SecurityAgent [88]
Path: /System/Library/CoreServices/SecurityAgent.app/Contents/MacOS/SecurityAgent
Identifier: SecurityAgent
Version: ??? (???)
Code Type: PPC (Native)
Parent Process: securityd [23]
Date/Time: 2008-08-09 08:01:30.882 +0100
OS Version: Mac OS X 10.5.4 (9E17)
Report Version: 6
Exception Type: EXCBADACCESS (SIGSEGV)
Exception Codes: KERNINVALIDADDRESS at 0x00000000c005d9ff
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0xfffeff18 objcmsgSendrtp + 24
1 com.apple.ExceptionHandling 0x00039d38 NSExceptionHandlerExceptionRaiser + 76
2 libobjc.A.dylib 0x9138d768 objcexceptionthrow + 68
3 ...yAgentPlugin.loginwindowUI2 0x000b6c58 0xa7000 + 64600
4 ...yAgentPlugin.loginwindowUI2 0x000c5b88 AuthorizationPluginCreate + 420
5 com.apple.securityagent 0x0000e064 0x1000 + 53348
6 com.apple.securityagent 0x000141fc Security::DataWalkers::Copier<AuthorizationValueVector>::Copier(AuthorizationVa lueVector const*, Security::Allocator&) + 3416
7 com.apple.securityagent 0x00013f60 Security::DataWalkers::Copier<AuthorizationValueVector>::Copier(AuthorizationVa lueVector const*, Security::Allocator&) + 2748
8 com.apple.securityagent 0x0000db54 0x1000 + 52052
9 com.apple.Foundation 0x96ae18f8 __NSFireMachPort + 88
10 com.apple.CoreFoundation 0x92df7778 __CFMachPortPerform + 180
11 com.apple.CoreFoundation 0x92e19804 CFRunLoopRunSpecific + 2480
12 com.apple.HIToolbox 0x9353f72c RunCurrentEventLoopInMode + 264
13 com.apple.HIToolbox 0x9353f550 ReceiveNextEventCommon + 412
14 com.apple.HIToolbox 0x9353f390 BlockUntilNextEventMatchingListInMode + 84
15 com.apple.AppKit 0x919ef058 _DPSNextEvent + 596
16 com.apple.AppKit 0x919eea10 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 112
17 com.apple.AppKit 0x919e86cc -[NSApplication run] + 736
18 com.apple.securityagent 0x00011e10 0x1000 + 69136
19 com.apple.securityagent 0x00002dac 0x1000 + 7596
Thread 0 crashed with PPC Thread State 32:
srr0: 0xfffeff18 srr1: 0x0200d930 dar: 0xc005d9ff dsisr: 0x00200000
r0: 0x00000001 r1: 0xbfffdfc0 r2: 0x00039d00 r3: 0x00176800
r4: 0x913be2f0 r5: 0x00000454 r6: 0x00003792 r7: 0x00000005
r8: 0x001fc080 r9: 0x92e87c44 r10: 0x96aaa5b8 r11: 0x6ec5e2f0
r12: 0xc005d9df r13: 0x00000000 r14: 0xa05d6478 r15: 0x7fffffff
r16: 0xffffffff r17: 0x00000001 r18: 0x00000000 r19: 0x00000000
r20: 0x00000000 r21: 0xa05d6478 r22: 0xbfffece0 r23: 0x00001003
r24: 0x00000060 r25: 0xbfffece0 r26: 0x00000001 r27: 0xbfffece0
r28: 0x00810e00 r29: 0x00176800 r30: 0x00000003 r31: 0x00039d00
cr: 0x44042484 xer: 0x20000000 lr: 0x00039d90 ctr: 0x952be73c
vrsave: 0x00000000
Binary Images:
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0x95f25000 - 0x95fbbfff com.apple.LaunchServices 289.2 (289.2) <67191ba4de2d3d14be9b4bbddd4fe0a6> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchS ervices.framework/Versions/A/LaunchServices
0x95fbc000 - 0x96081ffb com.apple.CoreData 100.1 (186) <9cf54cb19b18e53ee22edb7ababa6e6c> /System/Library/Frameworks/CoreData.framework/Versions/A/CoreData
0x96082000 - 0x964b7ffa libGLProgrammability.dylib ??? (???) <f032e07d587794af4d4ba1b7dc7b4fd2> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgramma bility.dylib
0x964b8000 - 0x964d7fff libresolv.9.dylib ??? (???) <ea4013600c24f794dff0013de3db4bf4> /usr/lib/libresolv.9.dylib
0x964d8000 - 0x96620ffb libicucore.A.dylib ??? (???) <dd2fd169aa328f6e97a1d700e5846866> /usr/lib/libicucore.A.dylib
0x96621000 - 0x96662ffb libTIFF.dylib ??? (???) <0d0a3107d26786c3708e6a511d5acec9> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/Resources/libTIFF.dylib
0x96663000 - 0x96663ffa com.apple.CoreServices 32 (32) <42b6dda539f7411606187335d9eae0c5> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
0x96664000 - 0x966eefff libvMisc.dylib ??? (???) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.fr amework/Versions/A/libvMisc.dylib
0x966ef000 - 0x96a18fe7 libLAPACK.dylib ??? (???) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.fr amework/Versions/A/libLAPACK.dylib
0x96a19000 - 0x96a66fff com.apple.framework.familycontrols 1.0.2 (1.0.2) <b022da52faf828234ebb48845ac7357a> /System/Library/PrivateFrameworks/FamilyControls.framework/Versions/A/FamilyCon trols
0x96a67000 - 0x96aa4ffe com.apple.securityfoundation 3.0 (32989) <d629b36fcfea256ec309420b99dccabf> /System/Library/Frameworks/SecurityFoundation.framework/Versions/A/SecurityFoun dation
0x96aa5000 - 0x96ceaffb com.apple.Foundation 6.5.5 (677.19) <1667218c075b6e69728c5c2dd9ff6065> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x96ceb000 - 0x96cf0fff com.apple.OpenDirectory 10.5 (10.5) <6dca8a620bb66310737d421624ebbfcd> /System/Library/PrivateFrameworks/OpenDirectory.framework/Versions/A/OpenDirect ory
0x96cf1000 - 0x96d2efff libRIP.A.dylib ??? (???) <7e5e8a6305111535e1297a342761ba27> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
0x96d2f000 - 0x96d2fff8 com.apple.Cocoa 6.5 (???) <e9a4f1c636d00893db0494c4040176ba> /System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa
0x96e83000 - 0x96efefff com.apple.SearchKit 1.2.0 (1.2.0) <1b448fbae02460eae76ee1c6883f45d6> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchK it.framework/Versions/A/SearchKit
0x96f4f000 - 0x96f54ff6 libmathCommon.A.dylib ??? (???) /usr/lib/system/libmathCommon.A.dylib
0x96fbe000 - 0x97014fff libGLU.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib
0x97015000 - 0x97022ffb com.apple.opengl 1.5.6 (1.5.6) <9f2c6a226837dae46ced8b28e195210c> /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
0xfffec000 - 0xfffeffff libobjc.A.dylib ??? (???) /usr/lib/libobjc.A.dylib
0xffff8000 - 0xffff9703 libSystem.B.dylib ??? (???) /usr/lib/libSystem.B.dylib

Unless you know of a specific log entry, I would hold off posting more that most can't decipher.
I understand that, but without knowing which specific bit of the log entry is relevant, it's hard to make that call. I'd hoped that by posting the whole thing someone could point me in a specific direction.
Most of the time it is a matter of trial and error and removing 3rd party devices, cables, and looking at 3rd party background processes, driver extensions, apps, haxies, and such.
The problem I have doesn't repeat itself after I've replaced the HD with my backup SD clone. Yet the SD clone was updated a week after this happened the first time, when I was sure that everything was working fine. It was then updated a couple of times after that, and 2 months must have gone by when it happened again yesterday, causing me to have to restore. So working on the principle of removing stuff in order to test whether its them, when they all seem to work fine for weeks, seems unlikely to be fruitful, as much as I'd like to know what it is.
You may need to reapply the combo update for 10.5.4, or do an archive and install.
I'd already performed the former. I guess an A & I can't hurt.

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