Shut down right after power up

My iMac G5, which of course just left warranty, turned itself off today. Now, when I power it on, the screen comes on, and it starts to boot for 10-60 seconds and then shuts off, never at exactly the same place.
It does this over and over.
My SN does fall within the range of power problem iMacs.
What am I looking at? Any chance this is RAM?
iMac G5 20 1.8 Mac OS X (10.4.3)

I am having the exact same problem. My SN did fall within the range and I called apple and they said it is not covered. It will start up in single user mode and I ran fsck and still not working. Starts up progress spins for a bit and then it shuts down and restarts itself. It does this over and over. Anybody have an idea?

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After the program crashes, is the captured footage saved?
What's the lab setup? Does each student have an individual user account? On each computer?
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Hi. When you were in the recovery drive doing permissions, did you try and run a repair of the boot drive? Did you try single user mode? Try these first and then go back and try to reinstall the operating system.When I say repair boot drive I don't mean permissions. There are both options in disk utilities.When you open disk utilities ,you will see in the left column two drives plus possibly a boot partition that look like an external driv. click on the second drive and in first aid use repair disk. If you still can't boot and it will not let you restore, you may have to do a clean install. http://support.apple.com/kb/PH18869?viewlocale=en_US

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HP 630, i3 processor, OS WIN7
Hello. I hope someone can hel me with this problem.
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Hello @Mainzer ,
Thanks for posting on the HP Forums!
I understand you are experiencing an issue with your notebook. However, since this is a commercial notebook, you should post your issue on the notebook board of the HP Enterprise Forums for a better answer.
Have a wonderful day!
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IMG_5528.jpeg
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Hello!
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OpenGL, lisäasetusten salliminen: True.
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Hi!
Win 7 64bit, tried in safemode with networking enabled, no help, same issue.
One funny thing more, I opened a pdf -file through explorer in cc and it asked me if i wanted to save the changes before closing application. I couldn't do anything for the pdf file, except to save it. ;]
What I want to say is, CC (or CS6) is not crashing, it's closing itself.
- K

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artbyval,
what is an “oils sue”?
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Quote from: XFM on 25-August-13, 08:33:22
"...hooked up everything correctly..."
"...he stuck a PCI-E 6 pin cord into the remaining 8 pin cpu atx female port..."
If that's true then it's not the same problem the OP had. Obviously if he did what is stated in the second statement then the first statement is not true.
Anyway if you are asking for help/advice then start your own topic instead of resurrecting/hijacking this topic.
I think you read into my post a little too much.
You are correct but BEFORE he plugged up the PCI-E to the extra CPU atx, the exact same issue was occurring. I might have questioned it if there was anything even minimally different after the new PSU, but it's the exact same. The old PSU obviously malfunctioned but the system itself seemed to show no signs of change.
I actually made the same mistake years ago with my intel core 2 duo. It seemed to fry my hdd but the rest of the system was fine. I guess it could just be chance on what does and doesn't die in the process. Point still is that his seems unchanged though.

Shut down right after power up

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