Mac Pro has died - it powers on but fans roar, screen stays black.

I had just woken my Mac Pro from sleeping overnight. It's running 10.4.8.
I open the boot hard disk in column view. I click the Applications folder to expand it into the next column.
The desktop disappears to be replaced by an all over blue raster. After a minute, that little grey rotating sun "wait" symbol you normally only see during start up, appears in the centre of the screen. I have no menubar or cursor.
I have been staring at this situation for five minutes now. I have never seen a Mac behave like this before.
I suppose the only option is to hold the power button in until the thing shuts down.
I shut it down with the power button. Powering up again, the fans roar, the screen remains dark, and that's the way it stays. No boot.
The only thing changed recently was the installation, yesterday, of the latest EFI Firmware Update v1.1.
I feel that this update has broken the computer. What are my options now?

Here's a copy of the relevent part of the log. I can't deduce what went wrong.
Dec 31 15:16:55 macpro kernel[0]: Intel8254x -- Link down -- 00:17:f2:00:39:8e -- called by disable() --
Dec 31 15:16:55 macpro kernel[0]: -- Auto-Neg Advertise Reg (04d) = 0xde1, Link Partner Ability Reg (05d) = 0xcde1, Gig Advertise Reg (09d) = 0xe00, Gig Link Partner Ability Reg (10d) = 0x7c00
Dec 31 15:16:55 macpro kernel[0]: Intel8254x -- Link down -- 00:17:f2:00:39:8f -- called by disable() --
Dec 31 15:16:55 macpro kernel[0]: -- Auto-Neg Advertise Reg (04d) = 0xde1, Link Partner Ability Reg (05d) = 0x0, Gig Advertise Reg (09d) = 0xe00, Gig Link Partner Ability Reg (10d) = 0x4000
Dec 31 15:16:58 macpro configd[75]: posting notification com.apple.system.config.network_change
Jan 1 10:12:26 macpro kernel[0]: System Sleep
Jan 1 10:12:26 macpro kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 1 10:12:26 macpro kernel[0]: Started CPU 01
Jan 1 10:12:26 macpro kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 1 10:12:26 macpro kernel[0]: Started CPU 02
Jan 1 10:12:26 macpro kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 1 10:12:26 macpro kernel[0]: Started CPU 03
Jan 1 10:12:26 macpro kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
Jan 1 10:12:26 macpro kernel[0]: System Wake
Jan 1 10:12:26 macpro kernel[0]: USB caused wake event (EHCI)
Jan 1 10:12:29 macpro kernel[0]: Intel8254x -- Link Up -- 00:17:f2:00:39:8e -- called by interruptOccurred() --
Jan 1 10:12:29 macpro kernel[0]: -- Auto-Neg Advertise Reg (04d) = 0xde1, Link Partner Ability Reg (05d) = 0xcde1, Gig Advertise Reg (09d) = 0xe00, Gig Link Partner Ability Reg (10d) = 0x7c00
Jan 1 10:12:31 macpro kernel[0]: Intel8254x -- Link down -- 00:17:f2:00:39:8f -- called by enableHardware() --
Jan 1 10:12:31 macpro configd[75]: posting notification com.apple.system.config.network_change
Jan 1 10:12:31 macpro kernel[0]: -- Auto-Neg Advertise Reg (04d) = 0xde1, Link Partner Ability Reg (05d) = 0x0, Gig Advertise Reg (09d) = 0xe00, Gig Link Partner Ability Reg (10d) = 0x4000
Jan 1 10:12:31 macpro lookupd[383]: lookupd (version 369.6) starting - Mon Jan 1 10:12:31 2007
Jan 1 10:12:36 macpro mDNSResponder: NOTE: Wide-Area Service Discovery disabled to avoid crashing defective DNS relay 192.168.1.254.
Jan 1 10:13:12 macpro /System/Library/CoreServices/mcxd.app/Contents/MacOS/mcxd: mcxd [387] Giving up waiting for mcxd process 386 to quit after waiting 30 seconds
Jan 1 10:13:14 macpro crashdump[389]: loginwindow crashed
Jan 1 10:13:14 macpro /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer: kCGErrorInvalidConnection : CGSGetNextEventRecord: Invalid connection
Jan 1 10:13:14 macpro /Applications/iTunes.app/Contents/Resources/iTunesHelper.app/Contents/MacOS/iTu nesHelper: kCGErrorInvalidConnection : CGSGetNextEventRecord: Invalid connection
Jan 1 10:13:14 macpro /Applications/TechTool Pro 4.app/Contents/SharedServices/0-StartupInit.service/Contents/Frameworks/TechToo lProtection.app/Contents/MacOS/TechToolProtection: kCGErrorInvalidConnection : CGSGetNextEventRecord: Invalid connection
Jan 1 10:13:14 macpro /Applications/Utilities/StuffIt 11/MagicMenu.app/Contents/MacOS/MagicMenu: kCGErrorInvalidConnection : CGSGetNextEventRecord: Invalid connection
Jan 1 10:13:14 macpro /Library/Application Support/Logitech/LCCDaemon.app/Contents/MacOS/LCCDaemon: kCGErrorInvalidConnection : CGSGetNextEventRecord: Invalid connection
Jan 1 10:40:51 localhost kernel[0]: hi mem tramps at 0xffe00000
Jan 1 10:40:51 localhost kernel[0]: PAE enabled
Jan 1 10:40:51 localhost kernel[0]: 64 bit mode enabled
Jan 1 10:40:51 localhost kernel[0]: standard timeslicing quantum is 10000 us
Jan 1 10:40:51 localhost kernel[0]: vmpagebootstrap: 973215 free pages
Jan 1 10:40:51 localhost kernel[0]: migtable_maxdispl = 71
Jan 1 10:40:51 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 1 10:40:52 localhost kernel[0]: 87 prelinked modules
Jan 1 10:40:52 localhost kernel[0]: ACPI CA 20060421
Jan 1 10:40:52 localhost kernel[0]: AppleIntelCPUPowerManagement: ready
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=0 LocalApicId=0 Enabled
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=1 LocalApicId=1 Enabled
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=2 LocalApicId=7 Enabled
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=3 LocalApicId=6 Enabled
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=4 LocalApicId=0 Disabled
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=5 LocalApicId=0 Disabled
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=6 LocalApicId=0 Disabled
Jan 1 10:40:52 localhost kernel[0]: AppleACPICPU: ProcessorApicId=7 LocalApicId=0 Disabled
Jan 1 10:40:52 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
Jan 1 10:40:52 localhost kernel[0]: The Regents of the University of California. All rights reserved.
Jan 1 10:40:52 localhost kernel[0]: using 16384 buffer headers and 4096 cluster IO buffer headers
Jan 1 10:40:52 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 1 10:40:52 localhost kernel[0]: Started CPU 01
Jan 1 10:40:52 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 1 10:40:52 localhost kernel[0]: Started CPU 02
Jan 1 10:40:52 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 1 10:40:52 localhost kernel[0]: IOAPIC: Version 0x20 Vectors 64:87
Jan 1 10:40:52 localhost kernel[0]: Started CPU 03
Jan 1 10:40:52 localhost kernel[0]: ACPI: System State [S0 S3 S4 S5] (S3)
Jan 1 10:40:52 localhost kernel[0]: Security auditing service present
Jan 1 10:40:52 localhost kernel[0]: BSM auditing present
Jan 1 10:40:52 localhost kernel[0]: disabled
Jan 1 10:40:52 localhost kernel[0]: rooting via boot-uuid from /chosen: D0D041A1-934C-43A6-9F40-9FD36B407BC9
Jan 1 10:40:52 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>
Jan 1 10:40:52 localhost kernel[0]: USB caused wake event (EHCI)
Jan 1 10:40:52 localhost kernel[0]: Got boot device = IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/SATA@1F,2/AppleAHCI/PRT1 @1/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorageDri ver/Hitachi HDS725050KLA360 Media/IOGUIDPartitionScheme/AppleHFS_Untitled1@2
Jan 1 10:40:52 localhost kernel[0]: BSD root: disk0s2, major 14, minor 2
Jan 1 10:40:52 localhost kernel[0]: jnl: replay_journal: from: 32989696 to: 16164864 (joffset 0xe8e000)
Jan 1 10:40:52 localhost kernel[0]: FireWire (OHCI) TI ID 8025 built-in now active, GUID 0016cbfffe6be2d2; max speed s800.
Jan 1 10:40:52 localhost kernel[0]: CSRHIDTransitionDriver::probe:
Jan 1 10:40:52 localhost kernel[0]: CSRHIDTransitionDriver::start before command
Jan 1 10:40:52 localhost kernel[0]: CSRHIDTransitionDriver::stop
Jan 1 10:40:52 localhost kernel[0]: IOBluetoothHCIController::start Idle Timer Stopped
Jan 1 10:40:52 localhost kernel[0]: HFS: Removed 143 orphaned unlinked files
Jan 1 10:40:52 localhost kernel[0]: Jettisoning kernel linker.
Jan 1 10:40:52 localhost kernel[0]: Resetting IOCatalogue.
Jan 1 10:40:52 localhost kernel[0]: Matching service count = 0
Jan 1 10:40:52 localhost kernel[0]: Matching service count = 0
Jan 1 10:40:52 localhost kernel[0]: Matching service count = 0
Jan 1 10:40:52 localhost kernel[0]: Matching service count = 0
Jan 1 10:40:52 localhost kernel[0]: Matching service count = 0
Jan 1 10:40:52 localhost kernel[0]: Matching service count = 0
Jan 1 10:40:52 localhost kernel[0]: wl0: Broadcom BCM4328 802.11 Wireless Controller
Jan 1 10:40:52 localhost kernel[0]: 4.80.46.0Previous Shutdown Cause: 0
Jan 1 10:40:52 localhost kernel[0]: IPv6 packet filtering initialized, default to accept, logging disabled
Jan 1 10:40:51 localhost mDNSResponder-108.2 (Aug 25 2006 14: 50:48)[30]: starting
Jan 1 10:40:51 localhost memberd[38]: memberd starting up
Jan 1 10:40:53 localhost lookupd[47]: lookupd (version 369.6) starting - Mon Jan 1 10:40:53 2007
Jan 1 10:40:53 localhost kernel[0]: jnl: replay_journal: from: 171520 to: 558592 (joffset 0x23beda1000)
Jan 1 10:40:53 localhost diskarbitrationd[36]: disk0s2 hfs 38F80FD8-FEAA-32FA-A2F4-0516ED890026 Brenda /
Jan 1 10:40:53 localhost diskarbitrationd[36]: disk1s2 hfs F4D426C5-27DB-3E57-B66F-481250D57EA6 Alice /Volumes/Alice
Jan 1 10:40:53 localhost diskarbitrationd[36]: disk2s2 ntfs 00000000-0000-0000-0000-000000000000 WindowsXP /Volumes/WindowsXP
Jan 1 10:40:53 localhost DirectoryService[48]: Launched version 2.1 (v353.5)
Jan 1 10:40:57 localhost kernel[0]: AppleIntel8254XEthernet: Ethernet address 00:17:f2:00:39:8e
Jan 1 10:40:57 localhost kernel[0]: AppleIntel8254XEthernet: Ethernet address 00:17:f2:00:39:8f
Jan 1 10:40:57 localhost kernel[0]: AirPort_Brcm43xx: Ethernet address 00:17:f2:95:46:e9
Jan 1 10:40:58 localhost kernel[0]: Registering For 802.11 Events
Jan 1 10:40:58 localhost kernel[0]: [HCIController][setupHardware] AFH Is Supported
Jan 1 10:40:59 localhost mDNSResponder: Adding browse domain local.
Jan 1 10:41:00 localhost kernel[0]: Intel8254x -- Link Up -- 00:17:f2:00:39:8e -- called by interruptOccurred() --
Jan 1 10:41:00 localhost kernel[0]: -- Auto-Neg Advertise Reg (04d) = 0xde1, Link Partner Ability Reg (05d) = 0xcde1, Gig Advertise Reg (09d) = 0xe00, Gig Link Partner Ability Reg (10d) = 0x3c00
Jan 1 10:41:00 localhost lookupd[72]: lookupd (version 369.6) starting - Mon Jan 1 10:41:00 2007
Jan 1 10:41:01 localhost /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow: Login Window Application Started
Jan 1 10:41:01 localhost loginwindow[74]: Login Window Started Security Agent
Jan 1 10:41:04 macpro kernel[0]: Intel8254x -- Link down -- 00:17:f2:00:39:8f -- called by enableHardware() --
Jan 1 10:41:04 macpro kernel[0]: -- Auto-Neg Advertise Reg (04d) = 0xde1, Link Partner Ability Reg (05d) = 0x0, Gig Advertise Reg (09d) = 0xe00, Gig Link Partner Ability Reg (10d) = 0x4000
Jan 1 10:41:04 macpro configd[34]: setting hostname to "macpro.local"
aped[67]: TechToolProtecti[104] is running as the super-user. It is not possible for Application Enhancer to affect this process in any manner whatsoever.
Jan 1 10:41:07 macpro configd[34]: executing /System/Library/SystemConfiguration/Kicker.bundle/Contents/Resources/enable-net work
Jan 1 10:41:07 macpro configd[34]: posting notification com.apple.system.config.network_change
Jan 1 10:41:07 macpro lookupd[108]: lookupd (version 369.6) starting - Mon Jan 1 10:41:07 2007
Jan 1 10:41:09 macpro kernel[0]: (90: aped)tfp: failed on 196:
Jan 1 10:41:09 macpro configd[34]: target=enable-network: disabled
Jan 1 10:41:11 macpro mDNSResponder: NOTE: Wide-Area Service Discovery disabled to avoid crashing defective DNS relay 192.168.1.254.
Mac Pro 3GHz/4GB/3xHDD/X1900XT + 2x30" Cinemas. Mac OS X (10.4.8) PMG5/DP2½GHz — PBG4/1GHz 12".

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