Intermittent boot up problemsI have a G5 Dual 2GHz machine

I have a G5 Dual 2GHz machine with 2Gb RAM. I have had an intermittent bootup problem every since installing Tiger.
The machine appears to start as normal, gets as far as the spinning cog wheel then just shuts itself down as if there was a power cut.
This happens every time I install an update and when I tryed to start up in verbose mode to try and work out why I can't see the message quick enough before it shuts down.
It will however boot up in safe mode and sometimes this fixes it if I then start up normally.
Other times I have to just leave it for about a half to one hour and it eventually boots up.
This problem is now happening more frequently not just after updates and can take several attempts to get it to boot properly.
If I run fsck in single user mode it reports that the file system is ok. If I run hard disk checks this also says everything is ok. I haven't as yet reinstalled a clean system.
Does anybody have any ideas? Is this hardware or software? Any suggestions appreciated.

Hi there,
Thanks for all your tips which I have tryed but it doesn't seem to make much difference. In fact the machine wil l now on ly boot in safeboot mode.
The Apple hardware test reported no faults. Disk utility verified that the hard disk was ok and I repaired permissions. I ran Tiger cacche leaner and said yes to all options. I also followed Al's suggestions and used font doctor to check out the fonts. It found three corrupted which I removed but this also did not make any difference.
I looked in the system log and found the following :
I don't know if they means anything to anybody:
system.log:
Description: System events log
Size: 30.41 KB
Last Modified: 31/08/2006 15:26
Location: /var/log/system.log
Recent Contents: ...
Aug 31 15:25:44 localhost mDNSResponder-107 (Mar 20 2005 20: 31:47)[69]: starting
Aug 31 15:25:45 localhost kernel[0]: MacRISC4CPU::start - found 'cy28508'
Aug 31 15:25:44 localhost diskarbitrationd[54]: disk1s3 hfs 074EB148-4C56-3B7A-AEC6-A46DD1035113 Excelsior /
Aug 31 15:25:45 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
Aug 31 15:25:45 localhost kernel[0]: The Regents of the University of California. All rights reserved.
Aug 31 15:25:45 localhost kernel[0]: using 5242 buffer headers and 4096 cluster IO buffer headers
Aug 31 15:25:45 localhost kernel[0]: DART enabled
Aug 31 15:25:45 localhost kernel[0]: MacRISC4CPU: publishing BootCPU
Aug 31 15:25:45 localhost kernel[0]: FireWire (OHCI) Apple ID 42 built-in now active, GUID 000a95ff feba07a2; max speed s800.
Aug 31 15:25:45 localhost kernel[0]: ApplePMU::PMU FORCED SHUTDOWN, CAUSE = -122
Aug 31 15:25:45 localhost kernel[0]: Extension "com.apple.driver.PioneerSuperDrive" has no kernel dependency.
Aug 31 15:25:45 localhost kernel[0]: Security auditing service present
Aug 31 15:25:45 localhost kernel[0]: BSM auditing present
Aug 31 15:25:45 localhost kernel[0]: disabled
Aug 31 15:25:45 localhost kernel[0]: rooting via boot-uuid from /chosen: 074EB148-4C56-3B7A-AEC6-A46DD1035113
Aug 31 15:25:45 localhost kernel[0]: Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Aug 31 15:25:45 localhost kernel[0]: Got boot device = IOService:/MacRISC4PE/ht@0,f2000000/AppleMacRiscHT/pci@7/IOPCI2PCIBridge/k2-sat a-root@C/AppleK2SATARoot/k2-sata@0/AppleK2SATA/ATADeviceNub@0/IOATABlockStorageD river/IOATABlockStorageDevice/IOBlockStorageDriver/ST3160023AS Media/IOApplePartitionScheme/AppleHFS_Untitled2@3
Aug 31 15:25:45 localhost kernel[0]: BSD root: disk1s3, major 14, minor 3
Aug 31 15:25:45 localhost kernel[0]: jnl: replay_journal: from: 4745728 to: 5205504 (joffset 0x1af000)
Aug 31 15:25:45 localhost kernel[0]: Jettisoning kernel linker.
Aug 31 15:25:45 localhost kernel[0]: Resetting IOCatalogue.
Aug 31 15:25:45 localhost kernel[0]: Matching service count = 0
Aug 31 15:25:45 localhost kernel[0]: IOPlatformControl::registerDriver Control Driver AppleSlewClock did not supply target-value, using default
Aug 31 15:25:45 localhost kernel[0]: IPv6 packet filtering initialized, default to accept, logging disabled
Aug 31 15:25:45 localhost kernel[0]: UniNEnet: Ethernet address 00:0a:95:ba:07:a2
Aug 31 15:25:46 localhost launchd: Server 2b13 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[60]: exited abnormally: Hangup
Aug 31 15:25:46 localhost lookupd[92]: lookupd (version 365) starting - Thu Aug 31 15:25:46 2006
Aug 31 15:25:46 localhost mDNSResponder: Couldn't read user-specified Computer Name; using default “Macintosh-000A95BA07A2” instead
Aug 31 15:25:46 localhost xinetd[73]: xinetd Version 2.3.11 started with libwrap options compiled in.
Aug 31 15:25:46 localhost xinetd[73]: Started working: 0 available services
Aug 31 15:25:46 localhost diskarbitrationd[54]: disk1s5 hfs 734BBC31-E33A-3B7A-864E-41F8B7D857FF Work /Volumes/Work
Aug 31 15:25:47 localhost diskarbitrationd[54]: disk1s7 hfs 31407C46-35BB-3104-855C-E77EDDFCC0F0 PSScratch /Volumes/PSScratch
Aug 31 15:25:48 Macintosh kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex
Aug 31 15:25:48 Macintosh configd[52]: setting hostname to "Macintosh.local"
Aug 31 15:25:51 Macintosh mDNSResponder: Couldn't read user-specified Computer Name; using default “Macintosh-000A95BA07A2” instead
Aug 31 15:25:52 Macintosh launchd: Server 2b17 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[92]: exited abnormally: Hangup
Aug 31 15:25:52 Macintosh configd[52]: executing /System/Library/SystemConfiguration/Kicker.bundle/Contents/Resources/enable-net work
Aug 31 15:25:52 Macintosh configd[52]: posting notification com.apple.system.config.network_change
Aug 31 15:25:52 Macintosh configd[52]: setting hostname to "Vigor10"
Aug 31 15:25:52 Macintosh lookupd[100]: lookupd (version 365) starting - Thu Aug 31 15:25:52 2006
Aug 31 15:25:52 Macintosh kernel[0]: ATY,Simone_A: vram [a0000000:04000000]
Aug 31 15:25:53 Macintosh kernel[0]: ATY,Simone_B: vram [a0000000:04000000]
Aug 31 15:25:54 Macintosh configd[52]: target=enable-network: disabled
Aug 31 15:25:54 Macintosh mDNSResponder: Couldn't read user-specified Computer Name; using default “Macintosh-000A95BA07A2” instead
Aug 31 15:25:54 Macintosh mDNSResponder: Adding browse domain local.
Aug 31 15:25:56 Macintosh /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow: Login Window Application Started
Aug 31 15:26:01 Macintosh loginwindow[151]: Login Window Started Security Agent
Aug 31 15:26:14 Macintosh /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer: (-3230) Cannot use ATS Persistent Store - switching to old FODB cache code
Aug 31 15:26:23 Macintosh KernelEventAgent[68]: tid 00000000 received unknown event (12)
The bit about the Apple PMU forced shutdown may be significant.
The only thing I can think to do is reinstall a clean system flolder unless anyone can suggest anything else.

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