IMac does not startup after any update and goes to sleep after a while

my iMac has a few issues anytime i install an update or app that requires a restart and i do restart my imac does not reboot as in it comes on the light comes on for 3 secs then the computer makes a click sound and shuts down again
if i try to put it on again it makes a very loud screaming noise i have disconnected all cables and turned it on again it will come on but the fans will be on full blast for a while.
when it does come on if i watch a movie after 30 mins it goes to sleep claiming overTemp
i have tried the cmdopt+O+PR after the second chord the system does exactly what i described above
its an iMac 17" G5 iSight (1.9GHz with 2.5GB Ram) 80GB free Space
please help

The screaming noise sounds like the HD may be dying.
Regarding your fan issue see Article:
http://docs.info.apple.com/article.html?artnum=301733 iMac G5: How to Reset the SMU (iMac G5, the iMac G5 (Ambient Light Sensor), and the iMac G5 (iSight)).
Also, check to see if your comp qualifies for the G5 iMac Repair Programs
**WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**

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