Imac Shutting Down on its own

Hi all. I've got an iMAC Intel running snow leopard. Today it shut down twice on me while i was on the internet. There was no warning and I had to switch it back on manually. I've had a look in the system log (as this is about the limit of my knowledge) and the following is an extract from roughly the time it occurred. It means nothing to me, but hopefully someone out there know?...any help greatly appreciated.
R
Feb 21 18:21:02 richard-oreillys-imac com.apple.WebKit.PluginAgent[181]: Debugger() was called!
Feb 21 18:21:32: --- last message repeated 2 times ---
Feb 21 18:22:35 richard-oreillys-imac com.apple.WebKit.PluginAgent[181]: Debugger() was called!
Feb 21 18:23:07 richard-oreillys-imac Safari[176]: INSERT-HANG-DETECTED: Tx time:3.354163, # of Inserts: 0, # of bytes written: 0, Did shrink: YES
Feb 21 18:23:34 richard-oreillys-imac com.apple.WebKit.PluginAgent[181]: Debugger() was called!
Feb 21 18:23:54 richard-oreillys-imac kernel[0]:
Feb 21 18:23:54: --- last message repeated 13 times ---
Feb 21 18:23:54 richard-oreillys-imac mds[40]: (/)(Error) IndexStore in sqlitebulkEnd:sqlite3BtreeCommit failed; rc = 13
Feb 21 18:23:54 richard-oreillys-imac kernel[0]:
Feb 21 18:24:24: --- last message repeated 1 time ---
Feb 21 18:25:59 richard-oreillys-imac com.apple.WebKit.PluginAgent[181]: Debugger() was called!
Feb 21 18:27:57 richard-oreillys-imac com.apple.WebKit.PluginAgent[181]: Debugger() was called!
Feb 21 18:28:46 localhost DirectoryService[11]: Improper shutdown detected
Feb 21 18:28:42 localhost com.apple.launchd[1]: * launchd[1] has started up. *
Feb 21 18:28:56 localhost mDNSResponder[17]: mDNSResponder mDNSResponder-214 (Oct 16 2009 06:09:30) starting
Feb 21 18:28:56 localhost configd[14]: BUG in libdispatch: 10C540 - 1678 - 0x9d37
Feb 21 18:28:57 localhost configd[14]: bootpsessiontransmit: bpf_write(en1) failed: Network is down (50)
Feb 21 18:28:57 localhost configd[14]: DHCP en1: INIT-REBOOT transmit failed
Feb 21 18:28:57 localhost configd[14]: network configuration changed.
Feb 21 18:28:57 richard-oreillys-imac configd[14]: setting hostname to "richard-oreillys-imac.local"
Feb 21 18:29:01 richard-oreillys-imac bootlog[47]: BOOT_TIME: 1266776921 0
Feb 21 18:29:01 richard-oreillys-imac fseventsd[41]: event logs in /.fseventsd out of sync with volume. destroying old logs. (1132 20 1195)
Feb 21 18:29:01 richard-oreillys-imac fseventsd[41]: log dir: /.fseventsd getting new uuid: 2DB1F4C2-DAE0-432C-9210-E0FAE7EB67F3
Feb 21 18:29:01 richard-oreillys-imac com.apple.usbmuxd[30]: usbmuxd-176 built for iTunesNineDot on Sep 24 2009 at 16:11:05, running 32 bit
Feb 21 18:29:02 richard-oreillys-imac blued[48]: Apple Bluetooth daemon started
Feb 21 18:29:02 richard-oreillys-imac /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[37]: Login Window Application Started
Feb 21 18:29:03 richard-oreillys-imac configd[14]: network configuration changed.
Feb 21 18:29:06 richard-oreillys-imac loginwindow[37]: Login Window Started Security Agent
Feb 21 18:29:06 richard-oreillys-imac loginwindow[37]: Login Window - Returned from Security Agent
Feb 21 18:29:06 richard-oreillys-imac loginwindow[37]: USER_PROCESS: 37 console
Feb 21 18:29:06 richard-oreillys-imac com.apple.launchd.peruser.501[77] (com.apple.ReportCrash): Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
Feb 21 18:29:08 richard-oreillys-imac com.apple.launchd.peruser.501[77] (com.apple.Kerberos.renew.plist[99]): Exited with exit code: 1
Feb 21 18:29:09 richard-oreillys-imac [0x0-0xa00a].com.skype.skype[107]: Main starting with pid 107 parent pid 77
Feb 21 18:29:09 richard-oreillys-imac Skype[107]: SkypeApplication::init called
Feb 21 18:29:09 richard-oreillys-imac Skype[107]: ChatCpntroller::loadWebViewHistory: could not load chat web view history, error (null)
Feb 21 18:29:09 richard-oreillys-imac com.apple.launchd.peruser.501[77] ([email protected][103]): Exited with exit code: 1
Feb 21 18:29:20 richard-oreillys-imac ntpd[26]: time reset +0.448606 s
Feb 21 18:29:37 richard-oreillys-imac com.apple.WebKit.PluginAgent[118]: Debugger() was called!
Feb 21 18:30:01 richard-oreillys-imac Safari[116]: INSERT-HANG-DETECTED: Tx time:9.964142, # of Inserts: 0, # of bytes written: 0, Did shrink: YES
Feb 21 18:30:25 richard-oreillys-imac com.apple.WebKit.PluginAgent[118]: Debugger() was called!
Feb 21 18:31:14 richard-oreillys-imac com.apple.WebKit.PluginAgent[118]: Debugger() was called!
Feb 21 18:31:15 richard-oreillys-imac Safari[116]: INSERT-HANG-DETECTED: Tx time:8.737168, # of Inserts: 0, # of bytes written: 0, Did shrink: YES
Feb 21 18:35:35 richard-oreillys-imac com.apple.WebKit.PluginAgent[118]: Debugger() was called!
Feb 21 18:38:32 richard-oreillys-imac com.apple.WebKit.PluginAgent[118]: Debugger() was called!
Feb 21 18:39:08 richard-oreillys-imac /System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer[108]: No valid tickets, timing out
Feb 21 18:39:59 richard-oreillys-imac com.apple.WebKit.PluginAgent[118]: Debugger() was called!
Feb 21 18:40:12 richard-oreillys-imac /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer[8 2]: BUG in libdispatch: 10C540 - 1730 - 0x11
Feb 21 18:40:18 richard-oreillys-imac System Preferences[149]: Could not connect the action resetLocationWarningsSheetOk: to target of class AppleSecurity_Pref
Feb 21 18:40:18 richard-oreillys-imac System Preferences[149]: Could not connect the action resetLocationWarningsSheetCancel: to target of class AppleSecurity_Pref
Feb 21 18:40:40 richard-oreillys-i

My iMac was doing something similar before it died completely. Motherboard fried. Mine was also an Intel iMac. I hope yours doesn't suffer the same fate.

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