Black screen and loud fan noise-- With Log Info

I am running 10.5.8 on a second gen iMac and am having problems with the fans running super loud, the screen goes black and it cannot be woken up. I have cleaned it out (no dust or dirt) and checked the caps (visually anyway) and they look fine. I am guessing that my power supply is going, but want to check the log (as recommended on the iMac forums) but cannot figure out how to get there. Below is from my log files from the past week.
May 14 16:01:57 localhost DirectoryService[11]: Improper shutdown detected
May 14 16:02:00 localhost kernel[0]: AppleSMU -- shutdown cause = -110
May 14 19:18:47 localhost DirectoryService[11]: Improper shutdown detected
May 14 19:18:48 localhost kernel[0]: AppleSMU -- shutdown cause = -110
May 14 19:18:58 localhost mds[38]: (/.Spotlight-V100/Store-V1/Stores/DB63D5B5-5269-4FAD-BFB2-674902BB3D6D)(Error) IndexCI in ContentIndexOpenBulk:Unclean shutdown of /.Spotlight-V100/Store-V1/Stores/DB63D5B5-5269-4FAD-BFB2-674902BB3D6D/live.2.; needs recovery
May 14 22:48:26 Macintosh shutdown[413]: halt by Hermitts:
May 14 22:48:26 Macintosh com.apple.loginwindow[39]: Shutdown NOW!
May 14 22:48:26 Macintosh com.apple.loginwindow[39]: System shutdown time has arrived^G^G
May 14 22:48:26 Macintosh shutdown[413]: SHUTDOWN_TIME: 1273891706 794211
May 15 06:54:27 localhost kernel[0]: AppleSMU -- shutdown cause = 1
May 15 09:32:21 localhost DirectoryService[11]: Improper shutdown detected
May 15 09:32:22 localhost kernel[0]: AppleSMU -- shutdown cause = -110
May 17 08:14:49 localhost DirectoryService[11]: Improper shutdown detected
May 17 08:14:53 localhost kernel[0]: AppleSMU -- shutdown cause = -110
May 17 08:15:08 Macintosh mds[38]: (/.Spotlight-V100/Store-V1/Stores/DB63D5B5-5269-4FAD-BFB2-674902BB3D6D)(Error) IndexCI in ContentIndexOpenBulk:Unclean shutdown of /.Spotlight-V100/Store-V1/Stores/DB63D5B5-5269-4FAD-BFB2-674902BB3D6D/live.2.; needs recovery
May 17 17:59:53 localhost DirectoryService[11]: Improper shutdown detected
May 17 17:59:54 localhost kernel[0]: AppleSMU -- shutdown cause = 3
May 17 20:48:47 localhost DirectoryService[11]: Improper shutdown detected
May 17 20:48:51 localhost kernel[0]: AppleSMU -- shutdown cause = -110
May 18 17:51:03 localhost DirectoryService[12]: Improper shutdown detected
May 18 17:51:04 localhost kernel[0]: AppleSMU -- shutdown cause = -110
May 18 17:51:18 localhost mds[41]: (/.Spotlight-V100/Store-V1/Stores/DB63D5B5-5269-4FAD-BFB2-674902BB3D6D)(Error) IndexCI in ContentIndexOpenBulk:Unclean shutdown of /.Spotlight-V100/Store-V1/Stores/DB63D5B5-5269-4FAD-BFB2-674902BB3D6D/live.0.; needs recovery
May 19 09:10:19 localhost DirectoryService[11]: Improper shutdown detected
May 19 09:10:20 localhost kernel[0]: AppleSMU -- shutdown cause = -110

Shutdown cause 110 is always a thermal problem, which means that your power supply has bitten the dust. It needs replacing, and hopefully, that will be all you need. If you are handy, go to [http://www.jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php] for instructions on replacing it.
Message was edited by: MGW

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