My imac spontneously shut down

Hello,
Just last night my imac (2007, 2.8ghz extreme, 10.8.3) just shut down (All that was open was 360Connect – I was watching a movie on my xbox). I tried to boot the machine back up this morning, but it only got as far as the grey screen with the grey apple when the fans started whirring and it wouldn't go any further.
I ran Disk Utility and, though there were a few issues, all were fixed and none seemed out of the ordinary. Apple Hardware Test reported no faults.
I tried a few times to get the mac to book, but each time it only got as far as the grey apple screen.
Ran AHT again, no faults, pressed the restart button and we're up again!
I have had to replace the power supply a couple of times over the eyars, and I feel like it's the culprit again now. Just wondered if anyone has any suggestions.
Cheers,
Kev.

Hello.
The computer's been on all day (albeit in sleep mode) and I just reset the SMC ... all seems okay. However, I just had a look in teh Console app, at the time when the imac crashed last night. Here's the message (ust wonder if it points to anything):
03/06/2013 23:10:01.390 WindowServer[95]: dict count after removing entry for window 0x35 is 0
03/06/2013 23:10:01.501 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.501 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.501 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.502 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.503 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.543 com.apple.launchd[1]: (com.apple.ShareKitHelper[33027]) Exited: Killed: 9
03/06/2013 23:10:01.541 com.apple.launchd.peruser.502[238]: ([0x0-0x5dc5dc].com.apple.inputmethod.ironwood[82895]) Exited: Killed: 9
03/06/2013 23:10:01.542 com.apple.launchd.peruser.502[238]: (com.evernote.EvernoteHelper[278]) Exited: Killed: 9
03/06/2013 23:10:01.547 com.apple.launchd.peruser.502[238]: (com.apple.FolderActions.enabled[305]) Exited: Killed: 9
03/06/2013 23:10:01.551 com.apple.launchd.peruser.502[238]: ([0x0-0x11011].org.corecode.SMARTReporter[318]) Exited: Killed: 9
03/06/2013 23:10:01.574 coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=207
03/06/2013 23:10:01.574 coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=214
03/06/2013 23:10:01.574 coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=4332
03/06/2013 23:10:01.579 coreservicesd[63]: SendFlattenedData, got error #268435459 (ipc/send) invalid destination port from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=194
03/06/2013 23:10:01.580 coreservicesd[63]: SendFlattenedData, got error #268435459 (ipc/send) invalid destination port from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=194
03/06/2013 23:10:01.616 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.617 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.617 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.617 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.617 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.631 coreservicesd[63]: SendFlattenedData, got error #268435459 (ipc/send) invalid destination port from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=211
03/06/2013 23:10:01.782 com.apple.launchd.peruser.502[238]: (com.apple.talagent[264]) Exited: Killed: 9
03/06/2013 23:10:01.797 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.798 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.798 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.798 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.798 WindowServer[95]: CGXGetConnectionProperty: Invalid connection 142919
03/06/2013 23:10:01.813 coreservicesd[63]: SendFlattenedData, got error #268435459 (ipc/send) invalid destination port from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=144
03/06/2013 23:10:01.831 coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyChildDeath to notificationID=105
03/06/2013 23:10:01.836 coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=100
03/06/2013 23:10:01.837 coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=114
03/06/2013 23:10:01.835 com.apple.launchd.peruser.502[238]: ([0x0-0x27027].com.apple.AppleSpell[1032]) Exited: Terminated: 15
03/06/2013 23:10:01.835 com.apple.launchd.peruser.502[238]: ([0x0-0x18b18b].com.apple.iTunesHelper[40830]) Exited with code: 1
03/06/2013 23:10:02.284 UserEventAgent[11]: Captive: [UserAgentDied:139] User Agent @port=47111 Died
03/06/2013 23:10:02.287 com.apple.launchd.peruser.502[238]: (com.apple.UserEventAgent-Aqua[241]) Exited: Killed: 9
03/06/2013 23:10:02.320 blued[55]: -[CBManager init] init returning self:0x7fcb41451ba0
03/06/2013 23:10:02.349 loginwindow[41]: DEAD_PROCESS: 41 console
03/06/2013 23:10:02.384 loginwindow[41]: Application terminate returned -600
03/06/2013 23:10:02.506 airportd[27637]: _doAutoJoin: Already associated to “Our broadband”. Bailing on auto-join.
03/06/2013 23:10:02.794 shutdown[27638]: halt by kev:
03/06/2013 23:10:02.000 kernel[0]: Kext loading now disabled.
03/06/2013 23:10:02.000 kernel[0]: Kext unloading now disabled.
Cheers,
Kev.

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7/22/09 8:39:44 PM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/22/09 8:39:50 PM org.ntp.ntpd[27] Error : nodename nor servname provided, or not known
7/22/09 8:39:54 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[74]) Exited: Terminated
7/22/09 8:39:54 PM com.apple.launchd[1] (com.apple.ScreenSharing.server[73]) Exited: Terminated
7/22/09 8:39:56 PM com.apple.launchd[81] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/22/09 8:39:56 PM com.apple.launchd[81] (org.x.startx) Unknown key for boolean: EnableTransactions
7/22/09 8:40:00 PM Dock[98] _DESCRegisterDockExtraClient failed 268435459
7/22/09 8:40:01 PM com.apple.launchd[81] ([email protected][85]) Exited with exit code: 1
7/22/09 8:51:04 PM iDVD[117] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz.
7/22/09 8:51:05 PM com.apple.loginwindow[36] Shutdown NOW!
7/22/09 8:51:05 PM com.apple.loginwindow[36] System shutdown time has arrived
7/22/09 9:18:06 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/22/09 9:18:06 PM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/22/09 9:18:06 PM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/22/09 9:18:06 PM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/22/09 9:18:06 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/22/09 9:18:06 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/22/09 9:18:06 PM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/22/09 9:18:17 PM org.ntp.ntpd[27] Error : nodename nor servname provided, or not known
7/22/09 9:18:20 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[74]) Exited: Terminated
7/22/09 9:18:20 PM com.apple.launchd[1] (com.apple.ScreenSharing.server[73]) Exited: Terminated
7/22/09 9:18:21 PM com.apple.launchd[83] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/22/09 9:18:21 PM com.apple.launchd[83] (org.x.startx) Unknown key for boolean: EnableTransactions
7/22/09 9:18:24 PM com.apple.launchd[83] ([email protected][87]) Exited with exit code: 1
7/22/09 9:30:03 PM iDVD[135] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz.
7/22/09 9:54:14 PM com.apple.launchd[83] (com.apple.Spotlight[93]) Exited abnormally: Segmentation fault
7/22/09 10:00:26 PM iDVD[228] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz.
7/23/09 10:53:01 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 10:53:01 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 10:53:01 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 10:53:01 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 10:53:01 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 10:53:01 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 10:53:01 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 10:53:14 AM com.apple.launchd[1] (com.apple.aslmanager) Throttling respawn: Will start in 9 seconds
7/23/09 10:53:14 AM com.apple.launchd[1] (com.apple.aslmanager) Throttling respawn: Will start in 9 seconds
7/23/09 10:53:14 AM com.apple.launchd[1] (com.apple.aslmanager) Throttling respawn: Will start in 9 seconds
7/23/09 10:53:16 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[74]) Exited: Terminated
7/23/09 10:53:16 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[73]) Exited: Terminated
7/23/09 10:53:16 AM com.apple.launchd[80] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/23/09 10:53:16 AM com.apple.launchd[80] (org.x.startx) Unknown key for boolean: EnableTransactions
7/23/09 10:53:17 AM com.apple.launchd[80] ([email protected][84]) Exited with exit code: 1
7/23/09 10:55:26 AM com.apple.launchctl.System[2] fsck_hfs: Volume is journaled. No checking performed.
7/23/09 10:55:26 AM com.apple.launchctl.System[2] fsck_hfs: Use the -f option to force checking.
7/23/09 10:55:29 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 10:55:29 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 10:55:29 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 10:55:29 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 10:55:29 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 10:55:29 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 10:55:29 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 10:55:39 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[72]) Exited: Terminated
7/23/09 10:55:39 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[71]) Exited: Terminated
7/23/09 10:55:41 AM com.apple.launchd[81] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/23/09 10:55:41 AM com.apple.launchd[81] (org.x.startx) Unknown key for boolean: EnableTransactions
7/23/09 10:55:50 AM com.apple.launchd[81] ([email protected][85]) Exited with exit code: 1
7/23/09 11:17:51 AM com.apple.launchctl.System[2] fsck_hfs: Volume is journaled. No checking performed.
7/23/09 11:17:51 AM com.apple.launchctl.System[2] fsck_hfs: Use the -f option to force checking.
7/23/09 11:17:54 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 11:17:54 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 11:17:54 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 11:17:54 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 11:17:54 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 11:17:54 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 11:17:54 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 11:18:10 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[75]) Exited: Terminated
7/23/09 11:18:10 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[74]) Exited: Terminated
7/23/09 11:18:10 AM com.apple.launchd[82] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/23/09 11:18:10 AM com.apple.launchd[82] (org.x.startx) Unknown key for boolean: EnableTransactions
7/23/09 11:18:12 AM com.apple.launchd[82] ([email protected][86]) Exited with exit code: 1
7/23/09 11:19:23 AM [0x0-0x12012].com.apple.Safari[115] Debugger() was called!
7/23/09 11:55:06 AM com.apple.launchctl.System[2] fsck_hfs: Volume is journaled. No checking performed.
7/23/09 11:55:06 AM com.apple.launchctl.System[2] fsck_hfs: Use the -f option to force checking.
7/23/09 11:55:08 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 11:55:08 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 11:55:08 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 11:55:08 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 11:55:08 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 11:55:08 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 11:55:08 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 11:55:25 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[76]) Exited: Terminated
7/23/09 11:55:25 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[75]) Exited: Terminated
7/23/09 11:55:25 AM com.apple.launchd[82] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/23/09 11:55:25 AM com.apple.launchd[82] (org.x.startx) Unknown key for boolean: EnableTransactions
7/23/09 11:55:25 AM com.apple.launchd[82] ([email protected][86]) Exited with exit code: 1
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] TMPDIR is set to '/var/folders/GC/GCWw-4RiGJSH3cFjActCtE+TI/-Tmp-/', unsetting it.
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] iMac EFI Firmware Update version 1.4
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] OS version is 10.5.7 build 9J61.
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] No AppleEFINVRAM
7/23/09 12:03:01 PM [0x0-0x19019].com.apple.updaters.imac.efifirmwareupdater14[140] Run the executable in the Contents/MacOS folder with '-h' option to learn about running remotely.

most likely caused by overheating due to video encoding increasing cpu usage (system freezing and shutdowns is a problem with older intel imacs). monitor your internal temps using an app like istat. temporary workaround is to use an fan control app like imacfancontrol and increase the cpu fan speeds. but this does not actually fix the problem which may arise more periodically as the system gets older.
http://www.islayer.com/apps/istatpro/
http://www.derman.com/Download/Special/iMacFanControl.html
there's a very long thread regarding this problem:
http://discussions.apple.com/thread.jspa?threadID=1467276&tstart=0

My imac spontneously shut down

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